Certification pursuant to 18 U.S.C. Section 1350

/s/ William W. Sherertz

/s/ Michael D. Mulholland

William W. Sherertz

Chief Executive Officer

March 14, 2008

Michael D. Mulholland

Chief Financial Officer

March 14, 2008

EX-32 7 dex32.htm CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 Certification pursuant to 18 U.S.C. Section 1350

EXHIBIT 32

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350

In connection with the Annual Report of Barrett Business Services, Inc. (the “Company”) on Form 10-K for the year ended December 31, 2007 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned certify, pursuant to 18 U.S.C. § 1350, 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.