Exhibit 99.01

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Occupational Health + Rehabilitation Inc
(the "Company") on Form 10-K for the year ending December 31, 2002 as filed with
the Securities and Exchange Commission on the date hereof (the "Report"), I,
John C. Garbarino, Chief Executive Officer of the Company, and I, Keith G. Frey,
Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C.
(ss.)1350, as adopted pursuant to (ss.)906 of the Sarbanes-Oxley Act of 2002,
that to the best of our knowledge:

     (1) The Report fully complies with the requirements of Section 13(a) or
     15(d) of the Securities Exchange Act of 1934; and

     (2) The information contained in the Report fairly presents, in all
     material respects, the financial condition and result of operations of the
     Company.

/s/ John C. Garbarino                                  /s/ Keith G. Frey
John C. Garbarino                                      Keith G. Frey
Chief Executive Officer                                Chief Financial Officer

March 28, 2003                                         March 28, 2003