POWER OF ATTORNEY
KNOW ALL PEOPLE BY THESE PRESENT, that the undersigned hereby constitutes
and appoints each of James Brill and Peter Dameris as her true and lawful to:
(1) execute for and on behalf of the undersigned, in the undersigned's capacity as an
officer and/or director of On Assignment, Inc. (the "Company"), any and all Forms 3, 4 and 5 required to be
filed by the undersigned in accordance with Section 16(a) of the Securities Exchange Act of 1934, as amended,
and the rules thereunder;
(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 and timely file such form with the
United States Securities and Exchange Commission and any stock exchange or similar authority; and
(3) take any other action of any type whatsoever in connection with the foregoing which,
in the opinion of such may be of benefit to, in the best interest of, or legally required by,
the undersigned, it being understood that the documents executed by such on behalf of the
undersigned, pursuant to this Power of Attorney, shall be in such form and shall contain such terms and
conditions as such may approve in his/her discretion.
The undersigned hereby grants to such full power and authority to do and
perform all and every act and thing whatsoever requisite, necessary, and 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 undersigned might or
could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming
all that such or his/her substitute or substitutes, 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 no such in serving in such capacity at the request of the undersigned, is hereby assuming,
nor is the Company hereby 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
required to file Forms 3, 4 and 5 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
IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this
19th day of October, 2016.
/s/ Theodore S. Hanson
Theodore S. Hanson