POA

POWER OF ATTORNEY

The undersigned hereby constitutes and appoints each
of Anthony Harris and Ben Ward, signing singly, the
undersigned's true and lawful attorney-in-fact to:

1. Execute for and on behalf of the
undersigned, in the undersigned's capacity as an officer
and/or director of Barrett Business Services, Inc. (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 undersigned's ownership, acquisition, or disposition
of securities of the Company, including forms required
to generate codes for the Securities and Exchange
Commission's electronic filing system; and

2. Do and perform any and all acts for and on
behalf of the undersigned which may be necessary or
desirable to complete and execute any such Form 3, 4, or
5, or other form or report, and timely file such form or
report with the United States Securities and Exchange
Commission and any stock exchange or similar authority
as appropriate.

The undersigned hereby grants to each such
attorney-in-fact full power and authority to do and
perform any and every act and thing 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
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undersigned could do if personally present, hereby
ratifying and confirming all that such
attorney-in-fact 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, and the Company is not assuming, any of the
undersigned's 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
subject to Section 16 of the Securities Exchange Act of
1934 with respect to the undersigned's 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.

IN WITNESS WHEREOF, the undersigned has caused
this Power of Attorney to be executed as of this 7 day of
June, 2022.

/s/ Alexandra Morehouse McReynolds
Alexandra Morehouse McReynolds