8-K

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT

                       Pursuant to Section 13 or 15(d) of
                       The Securities Exchange Act of 1934

         Date of Report (Date of earliest event reported): June 23, 2000

                           IRON MOUNTAIN INCORPORATED
                           --------------------------
             (Exact name of registrant as specified in its charter)

      Pennsylvania                   1-13045                     23-2588479
      ------------                   -------                     ----------
(State or other jurisdiction       (Commission                  (IRS Employer
    of incorporation)              File Number)              Identification No.)


                               745 Atlantic Avenue
                           Boston, Massachusetts 02111
- --------------------------------------------------------------------------------
          (Address of principal executive offices, including zip code)




                                 (617) 535-4766
- --------------------------------------------------------------------------------
              (Registrant's telephone number, including area code)










Item 5.  Other Events

         On June 23, 2000, Iron Mountain  Incorporated (the "Company") announced
that Chairman and Chief Executive  Officer Richard Reese will assume  additional
responsibilities as the President of the Company and that the current President,
J. Peter  Pierce,  is  resigning  to pursue  other  interests.  Mr.  Pierce will
continue as a member of the  Company's  Board of  Directors.  The  Company  also
announced that Bob Miller has been appointed the chief operating  officer of the
Company's Records Management Division.  For more information,  see the Company's
press release, dated June 23, 2000, which is attached herewith as Exhibit 99 and
incorporated by reference herein.

Item 7.  Financial Statements, Pro Form Financial Information and Exhibits

(c)      Exhibits.

Exhibit No.       Item

99                Press Release, dated June 23, 2000.







                                   SIGNATURES


         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  Registrant  has duly  caused  this report to be signed on its behalf by the
undersigned thereunto duly authorized.

                                    IRON MOUNTAIN INCORPORATED
                                    (Registrant)




                                    By: /s/  Jean A. Bua
                                        Jean A. Bua
                                        Vice President and Corporate Controller


Date:   June 23, 2000

EX-99

                                                                      Exhibit 99

FOR IMMEDIATE RELEASE:

Contact:      John F. Kenny, Jr.
              Executive Vice President and

              Chief Financial Officer
              617.535.4799


            IRON MOUNTAIN INCORPORATED CHAIRMAN AND CEO RICHARD REESE

               TO ASSUME ADDITIONAL RESPONSIBILITIES AS PRESIDENT;

                             BOB MILLER BECOMES COO


BOSTON - June 23, 2000 - Iron Mountain  Incorporated  (NYSE: IRM), the leader in
records and information  management services,  today announced that Chairman and
Chief Executive Officer Richard Reese will assume additional responsibilities as
president of the company.  Peter Pierce,  who became  president of Iron Mountain
upon the company's  merger with Pierce Leahy  Corporation  in February  2000, is
resigning  to  pursue  other  interests  and will  continue  as a member of Iron
Mountain's Board of Directors.
         "Peter  Pierce not only did an  outstanding  job building  Pierce Leahy
Corporation  into a major  force  in the  industry,  but has  been an  extremely
valuable  member of our executive  team as the  integration of our two companies
has  proceeded,"  Reese said.  "After  completing the merger in February,  Peter
worked  diligently  with me to place the right people in the right  positions to
foster the  continued  growth of the  business.  His counsel and  guidance  will
remain a valuable  resource as he continues his role as a member of the Board of
Directors."
         Pierce  commented,  "I have decided that after  completing  the initial
phase of the  integration,  it is time for me to move on to the next stage in my
career.  I have  enjoyed  serving as Iron  Mountain's  president  during what is
proving to be a highly successful  integration process, and I intend to continue
contributing to the company's growth as a member of the Board."

                                   -- more --



Reese Assumes Additional Responsibilities at Iron Mountain Incorporated / 2



         Iron Mountain also announced  today that Bob Miller will assume the new
position  of chief  operating  officer  of Iron  Mountain's  Records  Management
Division,  located in  Collegeville,  PA. Most recently the company's  executive
vice  president,  southern  area,  Miller has held various  management and sales
positions  at Iron  Mountain,  including  regional  vice  president,  during his
15-year career with the company. "I look forward to working with Bob Miller as a
member of our  executive  team,"  Reese said.  "Bob's  experience  and record of
success at Iron  Mountain  will enable us to continue  the growth of our records
management business."

About Iron Mountain Incorporated
         Iron  Mountain  Incorporated  is the leader in records and  information
management services.  As an international,  full service provider of records and
information  management  services,  Iron Mountain currently provides services to
over 100,000  customer  accounts in 77 markets in the United  States,  including
more than half of the  Fortune  500,  and over  15,000  customer  accounts in 31
markets  outside the United States.  The company  currently  operates nearly 500
records management  facilities in the United States and approximately 90 outside
the   United   States.   For   more   information,   visit   our  Web   site  at
www.ironmountain.com.

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