EXHIBIT 99.2

                            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 Barrett  Business  Services,  Inc. (the
"Company")  on Form 10-K for the year ended  December 31, 2002 as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), I, Michael
D. Mulholland,  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:

     (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 results of operations of the
Company.

A signed  original of this  written  statement  required by Section 906 has been
provided  to Barrett  Business  Services,  Inc.  and will be retained by Barrett
Business Services, Inc., and furnished to the Securities and Exchange Commission
or its staff upon request.

/s/ Michael D. Mulholland
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Michael D. Mulholland
Chief Financial Officer
April 11, 2003