SC 13D

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

(Rule 13d-101)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT

TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO

§ 240.13d-2(a)

(Amendment No.  )1

Michael Baker Corporation.

(Name of Issuer)

Common Stock, par value $1.00 per share

(Title of Class of Securities)

057149106

(CUSIP Number)

JEFFREY C. SMITH

STARBOARD VALUE LP

599 Lexington Avenue, 19th Floor

New York, New York 10022

(212) 845-7977

STEVEN WOLOSKY, ESQ.

OLSHAN GRUNDMAN FROME ROSENZWEIG & WOLOSKY LLP

Park Avenue Tower

65 East 55th Street

New York, New York 10022

(212) 451-2300

(Name, Address and Telephone Number of Person

Authorized to Receive Notices and Communications)

August 18, 2011

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box ¨.

Note:  Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits.  See § 240.13d-7 for other parties to whom copies are to be sent.

_______________

1              The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP NO. 057149106

1	NAME OF REPORTING PERSON STARBOARD VALUE AND OPPORTUNITY MASTER FUND LTD
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION CAYMAN ISLANDS
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 380,175
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 380,175
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 380,175
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 4.1%
14	TYPE OF REPORTING PERSON CO

2

CUSIP NO. 057149106

1	NAME OF REPORTING PERSON STARBOARD VALUE AND OPPORTUNITY S LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 209,825
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 209,825
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 209,825
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 2.3%
14	TYPE OF REPORTING PERSON OO

3

CUSIP NO. 057149106

1	NAME OF REPORTING PERSON STARBOARD VALUE LP
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 590,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 590,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 590,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.3%
14	TYPE OF REPORTING PERSON PN

4

CUSIP NO. 057149106

1	NAME OF REPORTING PERSON STARBOARD VALUE GP LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 590,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 590,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 590,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.3%
14	TYPE OF REPORTING PERSON OO

5

CUSIP NO. 057149106

1	NAME OF REPORTING PERSON STARBOARD PRINCIPAL CO LP
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 590,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 590,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 590,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.3%
14	TYPE OF REPORTING PERSON PN

6

CUSIP NO. 057149106

1	NAME OF REPORTING PERSON STARBOARD PRINCIPAL CO GP LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 590,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 590,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 590,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.3%
14	TYPE OF REPORTING PERSON OO

7

CUSIP NO. 057149106

1	NAME OF REPORTING PERSON JEFFREY C. SMITH
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 590,000
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 590,000
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 590,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.3%
14	TYPE OF REPORTING PERSON IN

8

CUSIP NO. 057149106

1	NAME OF REPORTING PERSON MARK MITCHELL
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 590,000
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 590,000
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 590,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.3%
14	TYPE OF REPORTING PERSON IN

9

CUSIP NO. 057149106

1	NAME OF REPORTING PERSON PETER A. FELD
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 590,000
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 590,000
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 590,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.3%
14	TYPE OF REPORTING PERSON IN

10

CUSIP NO. 057149106

The following constitutes the Schedule 13D filed by the undersigned (the “Schedule 13D”).

Item 1. Security and Issuer.

This statement relates to the Common Stock, par value $1.00 per share (the “Shares”), of Michael Baker Corporation (the “Issuer”).  The address of the principal executive offices of the Issuer is Airside Business Park, 100 Airside Drive, Moon Township, PA 15108.

Item 2. Identity and Background.

(a)           This statement is filed by:

(i) Starboard Value and Opportunity Master Fund Ltd, a Cayman Islands exempted company (“Starboard V&O Fund”), with respect to the Shares directly and beneficially owned by it;

(ii) Starboard Value and Opportunity S LLC, a Delaware limited liability company (“Starboard LLC”), with respect to the Shares directly and beneficially owned by it;

(iii) Starboard Value LP (“Starboard Value LP”), as the investment manager of Starboard V&O Fund and the manager of Starboard LLC;

(iv) Starboard Value GP LLC (“Starboard Value GP”), as the general partner of Starboard Value LP;

(v) Starboard Principal Co LP (“Principal Co”), as a member of Starboard Value GP;

(vi) Starboard Principal Co GP LLC (“Principal GP”), as the general partner of Principal Co;

(vii) Jeffrey C. Smith, as a member of Principal GP and as a member of each of the Management Committee of Starboard Value GP and the Management Committee of Principal GP;

(viii) Mark Mitchell, as a member of Principal GP and as a member of each of the Management Committee of Starboard Value GP and the Management Committee of Principal GP; and

(ix) Peter A. Feld, as a member of Principal GP and as a member of each of the Management Committee of Starboard Value GP and the Management Committee of Principal GP.

Each of the foregoing is referred to as a “Reporting Person” and collectively as the “Reporting Persons.”  Each of the Reporting Persons is party to that certain Joint Filing Agreement, as further described in Item 6.  Accordingly, the Reporting Persons are hereby filing a joint Schedule 13D.

(b)           The address of the principal office of each of Starboard LLC, Starboard Value LP, Starboard Value GP, Principal Co, Principal GP, and Messrs. Smith, Mitchell and Feld is 599 Lexington Avenue, 19th Floor, New York, New York 10022.  The address of the principal office of Starboard V&O Fund is c/o Citco Fund Services (Cayman Islands) Limited, Regatta Office Park, Windward 1, 2nd Floor, PO Box 31106, Grand Cayman KY1-1205, Cayman Islands.  The officers and directors of Starboard V&O Fund and their principal occupations and business addresses are set forth on Schedule A and are incorporated by reference in this Item 2.

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CUSIP NO. 057149106

(c)           The principal business of Starboard V&O Fund is serving as a private investment fund.  Starboard V&O Fund has been formed for the purpose of making equity investments and, on occasion, taking an active role in the management of portfolio companies in order to enhance shareholder value.  Starboard LLC has been formed for the purpose of investing in securities and engaging in all related activities and transactions.  Starboard Value LP provides investment advisory and management services and acts as the investment manager of Starboard V&O Fund and the manager of Starboard LLC.  The principal business of Starboard Value GP is providing a full range of investment advisory, pension advisory and management services and serving as the general partner of Starboard Value LP.  The principal business of Principal Co is providing investment advisory and management services.  Principal Co is a member of Starboard Value GP.  Principal GP serves as the general partner of Principal Co.  Messrs. Smith, Mitchell and Feld serve as members of Principal GP and the members of each of the Management Committee of Starboard Value GP and the Management Committee of Principal GP.

(d)           No Reporting Person, nor any person listed on Schedule A, annexed hereto, has, during the last five years, been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).

(e)           No Reporting Person, nor any person listed on Schedule A, annexed hereto, has, during the last five years, been party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

(f)           Messrs. Smith, Mitchell and Feld are citizens of the United States of America.  The citizenship of the persons listed on Schedule A is set forth therein.

Item 3. Source and Amount of Funds or Other Consideration.

The Shares purchased by each of Starboard V&O Fund and Starboard LLC were purchased with working capital (which may, at any given time, include margin loans made by brokerage firms in the ordinary course of business) in open market purchases, except as otherwise noted, as set forth in Schedule B, which is incorporated by reference herein.  The aggregate purchase price of the 380,175 Shares beneficially owned by Starboard V&O Fund is approximately $7,775,498, excluding brokerage commissions.  The aggregate purchase price of the 209,825 Shares beneficially owned by Starboard LLC is approximately $4,296,656, excluding brokerage commissions.

Item 4. Purpose of Transaction.

The Reporting Persons originally purchased the Shares based on the Reporting Persons’ belief that the Shares, when purchased, were undervalued and represented an attractive investment opportunity.  Depending upon overall market conditions, other investment opportunities available to the Reporting Persons, and the availability of Shares at prices that would make the purchase or sale of Shares desirable, the Reporting Persons may endeavor to increase or decrease their position in the Issuer through, among other things, the purchase or sale of Shares on the open market or in private transactions or otherwise, on such terms and at such times as the Reporting Persons may deem advisable.

12

CUSIP NO. 057149106

On August 25, 2011, Starboard Value LP delivered a letter to Brad Mallory, President and Chief Executive Officer of the Issuer, and to the members of the Issuer’s Board of Directors (the “Board”).  In the letter, Starboard Value LP expressed its belief that the Issuer is significantly undervalued and there are meaningful opportunities to greatly improve both operating and stock price performance.  Starboard Value LP stated that the two primary drivers behind the Issuer’s underperformance are its (i) insistence on continuing to pursue acquisitions, likely priced at significantly higher multiples than where the Issuer currently trades, and (ii) its significant underperformance relative to competitors in terms of its utilization rate and other operating metrics.  Starboard Value LP urges the Issuer not to commit any more capital to pursuing additional acquisitions and instead focus on improving operating margins.   Starboard Value LP also assessed the Issuer’s recent cost-cutting initiatives and believes there is significant room for the Issuer to further reduce costs without meaningfully impacting its competitive positioning or revenue base.  Starboard Value LP expressed its concern with certain aspects of the Issuer’s corporate governance practices, noting that Institutional Shareholder Services (ISS) has recommended shareholders withhold their votes for all members of the Board for the past two years.  Starboard Value LP is hopeful of commencing a constructive dialogue with the Board to discuss the issues set forth in the letter.

A copy of the letter is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

No Reporting Person has any present plan or proposal which would relate to or result in any of the matters set forth in subparagraphs (a) - (j) of Item 4 of Schedule 13D except as set forth herein or such as would occur upon completion of any of the actions discussed herein.  The Reporting Persons intend to review their investment in the Issuer on a continuing basis.  Depending on various factors including, without limitation, the Issuer’s financial position and investment strategy, the price levels of the Shares, conditions in the securities markets and general economic and industry conditions, the Reporting Persons may in the future take such actions with respect to their investment in the Issuer as they deem appropriate including, without limitation, engaging in communications with management and the Board of the Issuer, engaging in discussions with third parties about the Issuer and the Reporting Persons’ investment, making proposals to the Issuer concerning changes to the capitalization, ownership structure, board structure (including seeking board representation or the annual election of directors) or operations of the Issuer, purchasing additional Shares, selling some or all of their Shares, engaging in short selling of or any hedging or similar transaction with respect to the Shares, or changing their intention with respect to any and all matters referred to in Item 4.

Item 5. Interest in Securities of the Issuer.

The aggregate percentage of Shares reported owned by each person named herein is based upon 9,323,755 Shares outstanding, as of July 31, 2011, which is the total number of Shares outstanding as reported in the Issuer’s Quarterly Report on Form 10-Q, filed with the Securities and Exchange Commission on August 9, 2011.

A. Starboard V&O Fund

(a) As of the close of business on August 24, 2011, Starboard V&O Fund beneficially owned 380,175 Shares.

Percentage: Approximately 4.1%.

(b) 1. Sole power to vote or direct vote: 380,175

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 380,175

4. Shared power to dispose or direct the disposition: 0

(c) The transactions in the Shares by Starboard V&O Fund during the past 60 days are set forth in Schedule B and are incorporated herein by reference.

B. Starboard LLC

(a) As of the close of business on August 24, 2011, Starboard LLC beneficially owned 209,825 Shares.

Percentage: Approximately 2.3%.

(b) 1. Sole power to vote or direct vote: 209,825

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 209,825

4. Shared power to dispose or direct the disposition: 0

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CUSIP NO. 057149106

(c) The transactions in the Shares by Starboard LLC during the past 60 days are set forth in Schedule B and are incorporated herein by reference.

C. Starboard Value LP

(a) Starboard Value LP, as the investment manager of Starboard V&O Fund and the Manager of Starboard LLC, may be deemed the beneficial owner of the (i) 380,175 Shares owned by Starboard V&O Fund and (ii) 209,825 Shares owned by Starboard LLC.

Percentage: Approximately 6.3%.

(b) 1. Sole power to vote or direct vote: 590,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 590,000

4. Shared power to dispose or direct the disposition: 0

(c) Starboard Value LP has not entered into any transactions in the Shares during the past 60 days.  The transactions in the Shares on behalf of each of Starboard V&O Fund and Starboard LLC during the past 60 days are set forth in Schedule B and are incorporated herein by reference.

D. Starboard Value GP

(a) Starboard Value GP, as the general partner of Starboard Value LP, may be deemed the beneficial owner of the (i) 380,175 Shares owned by Starboard V&O Fund and (ii) 209,825 Shares owned by Starboard LLC.

Percentage: Approximately 6.3%.

(b) 1. Sole power to vote or direct vote: 590,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 590,000

4. Shared power to dispose or direct the disposition: 0

(c) Starboard Value GP has not entered into any transactions in the Shares during the past 60 days.  The transactions in the Shares on behalf of each of Starboard V&O Fund and Starboard LLC during the past 60 days are set forth in Schedule B and are incorporated herein by reference.

E. Principal Co

(a) Principal Co, as a member of Starboard Value GP, may be deemed the beneficial owner of the (i) 380,175 Shares owned by Starboard V&O Fund and (ii) 209,825 Shares owned by Starboard LLC.

Percentage: Approximately 6.3%.

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CUSIP NO. 057149106

(b) 1. Sole power to vote or direct vote: 590,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 590,000

4. Shared power to dispose or direct the disposition: 0

(c) Principal Co has not entered into any transactions in the Shares during the past 60 days.  The transactions in the Shares on behalf of each of Starboard V&O Fund and Starboard LLC during the past 60 days are set forth in Schedule B and are incorporated herein by reference.

F. Principal GP

(a) Principal GP, as the general partner of Principal Co, may be deemed the beneficial owner of the (i) 380,175 Shares owned by Starboard V&O Fund and (ii) 209,825 Shares owned by Starboard LLC.

Percentage: Approximately 6.3%.

(b) 1. Sole power to vote or direct vote: 590,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 590,000

4. Shared power to dispose or direct the disposition: 0

(c) Principal GP has not entered into any transactions in the Shares during the past 60 days.  The transactions in the Shares on behalf of each of Starboard V&O Fund and Starboard LLC during the past 60 days are set forth in Schedule B and are incorporated herein by reference.

G. Messrs. Smith, Mitchell and Feld

(a) Each of Messrs. Smith, Mitchell and Feld, as a member of Principal GP and as a member of each of the Management Committee of Starboard Value GP and the Management Committee of Principal GP, may be deemed the beneficial owner of the (i) 380,175  Shares owned by Starboard V&O Fund and (ii) 209,825 Shares owned by Starboard LLC.

Percentage: Approximately 6.3%.

(b) 1. Sole power to vote or direct vote: 0

2. Shared power to vote or direct vote: 590,000

3. Sole power to dispose or direct the disposition: 0

4. Shared power to dispose or direct the disposition: 590,000

(c) None of Messrs. Smith, Mitchell or Feld has entered into any transactions in the Shares during the past 60 days.  The transactions in the Shares on behalf of each of Starboard V&O Fund and Starboard LLC during the past 60 days are set forth in Schedule B and are incorporated herein by reference.

To the best of the Reporting Persons’ knowledge, none of the persons listed on Schedule A, who are not also Reporting Persons, beneficially owns any securities of the Issuer.

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CUSIP NO. 057149106

(d) No person other than the Reporting Persons is known to have the right to receive, or the power to direct the receipt of dividends from, or proceeds from the sale of, the Shares.

(e) Not applicable.

Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.

On August 25, 2011, the Reporting Persons entered into a Joint Filing Agreement in which the Reporting Persons agreed to the joint filing on behalf of each of them of statements on Schedule 13D with respect to the securities of the Issuer to the extent required by applicable law.  The Joint Filing Agreement is attached hereto as Exhibit 99.2 and is incorporated herein by reference.

Item 7. Material to be Filed as Exhibits.

99.1 Letter to Brad Mallory and the Board, dated August 25, 2011.

99.2 Joint Filing Agreement by and among Starboard Value and Opportunity Master Fund Ltd, Starboard Value and Opportunity S LLC, Starboard Value LP, Starboard Value GP LLC, Starboard Principal Co LP, Starboard Principal Co GP LLC, Jeffrey C. Smith, Mark Mitchell and Peter A. Feld, dated August 25, 2011.

99.3 Power of Attorney for Jeffrey C. Smith, Mark Mitchell and Peter A. Feld, dated April 4, 2011.

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CUSIP NO. 057149106

SIGNATURES

After reasonable inquiry and to the best of his knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.

Dated:  August 25, 2011

STARBOARD VALUE AND OPPORTUNITY MASTER FUND LTD By: Starboard Value LP,        its investment manager   STARBOARD VALUE AND OPPORTUNITY S LLC By: Starboard Value LP,        its manager   STARBOARD VALUE LP By: Starboard Value GP LLC,        its general partner STARBOARD VALUE GP LLC By: Starboard Principal Co LP,        its member   STARBOARD PRINCIPAL CO LP By: Starboard Principal Co GP LLC,        its general partner   STARBOARD PRINCIPAL CO GP LLC

By:	/s/ Jeffrey C. Smith
	Name:	Jeffrey C. Smith
	Title:	Authorized Signatory

/s/ Jeffrey C. Smith

JEFFREY C. SMITH

Individually and as attorney-in-fact for

Mark Mitchell and Peter A. Feld

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CUSIP NO. 057149106

SCHEDULE A

Directors and Officers of Starboard Value and Opportunity Master Fund Ltd

Name and Position	Principal Occupation	Principal Business Address	Citizenship
Patrick Agemian Director	Director of Global Funds Management, Ltd.	PO Box 10034, Harbour Place 2nd Floor 103 South Church Street Grand Cayman Cayman Islands, KY1-1001	Canada
Mark Mitchell Director*
Don Seymour Director	Managing Director of dms Management Ltd.	dms Management Ltd. dms House, 20 Genesis Close P.O. Box 31910 Grand Cayman Cayman Islands, KY1-1208	Cayman Islands

* Mr. Mitchell is a Reporting Person and, as such, the information with respect to Mr. Mitchell called for by Item 2 of Schedule 13D is set forth therein.

CUSIP NO. 057149106

SCHEDULE B

Transactions in the Shares During the Past 60 Days

Shares of Common Stock Purchased/(Sold) Price Per Share($) Date of Purchase

STARBOARD VALUE AND OPPORTUNITY MASTER FUND LTD

31,650	20.9362	06/29/11
9,432	21.0420	06/30/11
34,308	21.0635	07/01/11
2,540	21.2500	07/05/11
10,428	21.0984	07/05/11
32,162	21.9203	07/07/11
25,400	21.8875	07/08/11
13,566	20.7076	07/28/11
5,080	20.4701	07/29/11
9,473	20.7201	08/01/11
722	20.6831	08/02/11
3,260	19.9833	08/03/11
16,300	19.7633	08/04/11
64,392	19.8981	08/05/11
10,588	19.4399	08/08/11
25,493	18.8407	08/09/11
(2,081)	19.0818	08/09/11
5,963	19.2355	08/10/11
12,160	19.2170	08/18/11
31,520	19.9953	08/19/11
782	19.9000	08/22/11
37,037	20.3693	08/23/11

STARBOARD VALUE AND OPPORTUNITY S LLC

18,350	20.9362	06/29/11
5,468	21.0420	06/30/11
19,721	21.0635	07/01/11
1,460	21.2500	07/05/11
5,994	21.0984	07/05/11
18,487	21.9203	07/07/11
14,600	21.8875	07/08/11
7,797	20.7076	07/28/11
2,920	20.4701	07/29/11
5,056	20.7201	08/01/11
386	20.6831	08/02/11
1,740	19.9833	08/03/11
8,700	19.7633	08/04/11
34,368	19.8981	08/05/11

CUSIP NO. 057149106

Shares of Common Stock Purchased/(Sold) Price Per Share($) Date of Purchase

5,652	19.4399	08/08/11
13,606	18.8407	08/09/11
(1,164)	19.0818	08/09/11
3,183	19.2355	08/10/11
6,491	19.2170	08/18/11
16,824	19.9953	08/19/11
418	19.9000	08/22/11
19,768	20.3693	08/23/11

EX-99.1

Exhibit 99.1

August 25, 2011

Brad Mallory

President and CEO

Michael Baker Corporation

Airside Business Park

100 Airside Drive

Moon Township, PA 15108

CC:           Board of Directors

Dear Brad,

Starboard Value LP, together with its affiliates, currently owns 6.3% of the outstanding common stock of Michael Baker Corporation (“Baker” or “the Company”), making us one of the Company’s largest shareholders.  Although you and your management team have not been available to speak with us, despite our numerous attempts to reach you, our views and recommendations outlined herein are based upon our extensive research and analysis of the Company.  We look forward to beginning a dialogue with you and the Board of Directors (the “Board”) at your earliest convenience to discuss the issues we set forth in this letter.

We believe Baker is significantly undervalued and there are meaningful opportunities to greatly improve both operating and stock price performance.  There are two primary drivers behind Baker’s stock price underperformance: (i) Baker’s insistence on continuing to pursue acquisitions, likely priced at significantly higher multiples than where Baker currently trades, and (ii) Baker’s significant underperformance relative to competitors in terms of its utilization rate and other operating metrics.  We also have concerns about certain aspects of Baker’s corporate governance practices, highlighted by the fact that for the past two years Institutional Shareholder Services (ISS) has recommended that shareholders withhold their votes for all members of the Board for, among other things “poor attendance” and “lack of board responsiveness to shareholder concerns.”

Stock Price Underperformance

As shown in the table below, over the last one-, three- and five-year periods, the Company’s stock price has declined by approximately 38%, 40% and 6%, respectively.  This performance is significantly worse than both Baker’s competitors and the market as a whole.

	Share Price Performance (1)
	1 Year	3 Year	5 Year
Russell 2000 Index	13.3%	-7.4%	-2.2%
Peer Group (2)	27.0%	-23.1%	-6.0%
Michael Baker Corporation	-37.9%	-40.2%	-6.2%
Underperformance vs. Russell	-51.2%	-32.8%	-4.0%
Underperformance vs. Peer Group	-64.9%	-17.1%	-0.2%
1. Performance as of August 23, 2011.
2. Peer Group consists of companies used in BKR proxy to set executive compensation and include TTEK, GVA, OII, MTZ, INSU, ENG, STRL, HIL and TRR.

While stock prices in the broader engineering and construction industry have been generally impacted by concerns over the economy and government spending, Baker’s stock price has declined more than the group as a whole, and trades at a significant discount to its peers on almost any metric.  For example, Baker currently trades at approximately 2.8x Wall Street’s 2011 EBITDA estimate compared to approximately 6.5x for the Peer Group.

Comparable Companies Analysis									($ in millions)
		Share	Market	Ent.	EV / Revenue		EV/EBITDA		P/E
Company	Ticker	Price	Cap	Value	CY11E	CY12E	CY11E	CY12E	CY11E	CY12E
BKR Proxy Comp Group
Tetra Tech Inc.	TTEK	19.01	1,188	1,219	0.66x	0.62x	6.0x	5.5x	13.3x	11.6x
Granite Construction Incorporated	GVA	17.83	690	622	0.31x	0.28x	4.6x	3.6x	19.5x	12.1x
Oceaneering International, Inc.	OII	37.96	4,120	3,969	1.87x	1.67x	8.5x	7.1x	19.0x	15.6x
MasTec, Inc.	MTZ	19.09	1,617	1,980	0.69x	0.64x	6.9x	5.8x	14.7x	12.4x
Insituform Technologies Inc.	INSU	13.44	531	555	0.58x	0.51x	5.1x	3.8x	10.6x	7.1x
ENGlobal Corp.	ENG	3.05	81	94	0.25x	0.22x	10.5x	3.6x	19.7x	5.9x
Sterling Construction Co. Inc.	STRL	12.08	199	155	0.31x	0.28x	4.0x	3.3x	16.2x	11.6x
Hill International, Inc.	HIL	5.22	201	291	0.68x	0.35x	31.8x	2.9x	n.a.	5.0x
TRC Companies Inc.	TRR	5.05	138	129	0.53x	0.51x	n.a.	n.a.	22.1x	17.2x
				Mean	0.65x	0.56x	9.7x	4.5x	16.9x	10.9x
				Median	0.58x	0.51x	6.5x	3.7x	17.6x	11.6x
Michael Baker Corporation	BKR	$20.57	$192	$104	0.20x	0.19x	2.8x	2.4x	12.5x	9.9x
Note: All estimates from Capital IQ.

Flawed Acquisition Strategy

Given Baker’s operational underperformance and industry-low valuation multiples, Baker should not be considering any acquisitions.  Based on the historical multiples that Baker has paid for acquisitions, and the multiples at which transactions in the industry typically occur, we believe that any acquisition Baker makes would continue to destroy significant shareholder value.

The Company’s acquisition of The LPA Group serves as a recent example.  On May 4, 2010, Baker acquired LPA for between 6.0x and 8.1x EBITDA.1  Since that time, Baker’s market valuation has declined by over 40%.  We believe LPA’s annual revenue has declined from approximately $95 million at the time of the acquisition to approximately $80 million over the last 12 months.  Therefore, a multiple calculated on LPA’s current EBITDA could look even worse.  The LPA deal is tangible evidence of the downside risk to shareholders caused by Baker’s flawed acquisition strategy.

We seriously question the rationale for continuing to pursue acquisitions, given inherent execution risk and valuation discrepancy, while the Company trades at such a depressed EBITDA multiple. Baker’s constant search for acquisition targets has been a clear distraction to management, as has been the integration process following any such acquisitions.  Rather than continuing to search for acquisitions at significantly higher multiples than where Baker trades, we believe the Company should instead focus on improving operating margins at the Company and using its cash to buy back its own stock at such a deeply discounted multiple.  This is a far better capital allocation decision than pursuing the current acquisition strategy.

Lagging Operating Performance

For years, Baker’s operating performance has significantly lagged its peers.  This gap has been accentuated during the recent economic slowdown.  Baker has among the lowest operating margins in its industry, which we believe is due to Baker’s low utilization rates, high number of under-sized offices, and inconsistent ability to generate revenue in certain regions and specialties.  We also believe Baker has a bloated overhead structure.

Not only is Baker’s utilization rate among the lowest in its industry, but it has failed to approach the targets that Baker’s own management has used to benchmark success.  In 2006, during the Company’s third quarter conference call, Richard Shaw, Baker’s current Chairman and then CEO, stated, “One of the keys to managing this company is just to look at the utilization rate.  When the utilization rate is in the 80% or above range, you’re running a profitable business.  When it’s down in the 60% level, either in office or by group or discipline, then now you’re in trouble.”  We note Baker’s utilization rate has been in the mid-50% range over the last year or more, and only recently returned to a peak of 66% in the second quarter of 2011.  Further, we believe that Baker has certain offices or groups for which the utilization rate is significantly below this level.  While we acknowledge that Baker’s business has changed with the sale of its energy segment, we nevertheless believe that Baker’s utilization level continues to significantly trail the overall industry.

1Based on LPA’s EBITDA, including Equity Income from Affiliates, of $7.3 million for the 12 months ended March 31, 2010, per Baker’s 8-K filing dated July 15, 2010, and a purchase price of $59.4 million, based on $51.4 million in cash paid at closing and $8.0 million in stock; on May 5, 2010, Baker filed an 8-K stating that the multiple paid for LPA was 6.0x adjusted EBITDA, but did not provide any detail on how that number was calculated or what adjustments were included.

While Baker has recently announced some cost-cutting and headcount reduction initiatives, these reductions account for an insignificant percentage of Baker’s workforce, and are far less than the reductions that Baker’s competitors have made.  Moreover, these limited cost-cutting initiatives came long after many of your competitors began reducing costs.  While we understand that Baker’s success is driven by its talented pool of engineers, we believe that there is significant room for Baker to further reduce costs without meaningfully impacting its competitive positioning or revenue base.  Given the weak macroeconomic environment and outlook for government spending, as well as the significantly larger cost reduction programs undertaken by Baker’s competitors, we do not believe increasing the scope of the Company’s cost-cutting initiatives would hinder Baker’s ability to retain its most talented, revenue-producing employees.

Conclusion

We firmly believe Baker is undervalued and there is a significant opportunity to improve both its operational performance and shareholder value.  The purpose of this letter is to clearly outline our concerns regarding the strategic direction and current performance of the Company.  We believe now is the time for the Board to take decisive action to address the significant concerns highlighted in this letter.  We strongly urge the Company not to commit any more capital to acquisitions at the current time given Baker’s depressed share price and instead use that cash to buy back its own stock.  We also encourage management and the Board to implement further cost reduction initiatives to bring utilization rates back to acceptable levels driving improved operating margin.  We look forward to the opportunity to work constructively with you and the Board of Directors to enhance value while ensuring that Baker is run with the best interests of all shareholders as the primary objective.

Best Regards,

/s/ Jeffrey C. Smith

Jeffrey C. Smith

Managing Member

Starboard Value LP

Contacts:

Peter Feld, (212) 201-4878

Gavin Molinelli, (212) 201-4828

EX-99.2

Exhibit 99.2

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a Statement on Schedule 13D (including additional amendments thereto) with respect to the shares of Common Stock, par value $1.00 per share, of Michael Baker Corporation.  This Joint Filing Agreement shall be filed as an Exhibit to such Statement.

Dated:  August 25, 2011

STARBOARD VALUE AND OPPORTUNITY MASTER FUND LTD By: Starboard Value LP,        its investment manager   STARBOARD VALUE AND OPPORTUNITY S LLC By: Starboard Value LP,        its manager   STARBOARD VALUE LP By: Starboard Value GP LLC,        its general partner STARBOARD VALUE GP LLC By: Starboard Principal Co LP,        its member   STARBOARD PRINCIPAL CO LP By: Starboard Principal Co GP LLC,        its general partner   STARBOARD PRINCIPAL CO GP LLC

By:	/s/ Jeffrey C. Smith
	Name:	Jeffrey C. Smith
	Title:	Authorized Signatory

/s/ Jeffrey C. Smith

JEFFREY C. SMITH

Individually and as attorney-in-fact for

Mark Mitchell and Peter A. Feld

EX-99.3

Exhibit 99.3

POWER OF ATTORNEY

The undersigned hereby appoints Jeffrey C. Smith, Mark Mitchell, Peter A. Feld and Kenneth R. Marlin, or any of them, his true and lawful attorney-in fact and agent to execute and file with the Securities and Exchange Commission any Schedule 13D, Schedule 13G, Form 3, Form 4, Form 5, any settlement agreement, any amendments to any of the foregoing and any related documentation which may be required to be filed in his individual capacity as a result of the undersigned’s beneficial ownership of, or participation in a group with respect to, securities directly or indirectly beneficially owned by Starboard Value and Opportunity Fund Ltd, Starboard Value LP, Starboard Value GP LLC, Starboard Principal Co LP and Starboard Principal Co GP LLC or any of their respective affiliates, and granting unto said attorney-in-fact and agent full power and authority to do and perform each and every act and thing which he might or could do in person, hereby ratifying and confirming all that said attorney-in-fact and agent may lawfully do or cause to be done by virtue hereof. The authority of Jeffrey C. Smith, Mark Mitchell, Peter A. Feld and Kenneth R. Marlin, or any of them, under this Power of Attorney shall continue with respect to the undersigned until revoked in writing.

Date: April 4, 2011

/s/ Jeffrey C. Smith

Jeffrey C. Smith

/s/ Mark Mitchell

Mark Mitchell

/s/ Peter A. Feld

Peter A. Feld