POWER OF ATTORNEY
Know all by these presents, that the undersigned, as a Section 16 reporting person of
Medidata Solutions, Inc. (the Company), hereby constitutes and appoints each of Michael I. Otner and
Kathryn E. Schneider, signing singly, the undersigneds true and lawful attorney-in-fact to:
(1) prepare, execute in the undersigneds name and on the undersigneds behalf, and submit to the U.S. Securities and Exchange Commission (the SEC) amendments to Form ID and any other documents necessary or appropriate to obtain or maintain codes and passwords enabling the undersigned to make electronic filings with the SEC of reports required by Section 16(a) of the Securities Exchange Act of 1934 or any rule or regulation of the SEC;
(2) execute for and on behalf of the undersigned, as a Section 16 reporting person of the Company, Forms 3, 4, and 5 in accordance with Section 16(a) of the Securities Exchange Act of 1934 and the rules thereunder, and any other forms or reports the undersigned may be required to file in connection with the undersigneds ownership, acquisition, or disposition of securities of the Company (collectively, Company Securities Transaction Filings);
(3) do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete, execute and timely file such Company Securities Transaction Filings with the SEC and any stock exchange or similar authority; and
(4) take any other action of any type whatsoever in connection with the foregoing which, in the opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the undersigned, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-facts discretion.
       The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-facts substitute or substitutes, shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers herein granted.  The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Company assuming, any of the undersigneds responsibilities to comply with Section 16 of the Securities Exchange Act of 1934.
       This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4, and 5 with respect to the undersigneds holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact.  This Power of Attorney supersedes all prior Powers of Attorney executed by me with respect to Company Securities Transaction Filings made after the date of signature below.

      [signature page to follow]

       IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 22nd day of July, 2015.

                           Signature:     /s/ Steven Hirschfeld
                           Print Name:    Steven Hirschfeld


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