Attached files

file filename
EX-31.2 - CERTIFICATION OF CFO - ASGN Incex31_2.htm
EX-31.1 - CERTIFICATION OF CEO - ASGN Incex31_1.htm
EX-21.1 - SUBSIDIARIES OF THE REGISTRANT - ASGN Incex21_1.htm
EX-32.1 - CERTIFICATION OF CEO AND CFO - ASGN Incex32_1.htm
EX-10.10 - AMENDED CIC SEVERANCE SUMMARY PLAN - ASGN Incex10_10.htm
EX-10.17 - CEO EMPLOYMENT AGREEMENT - ASGN Incex10_17.htm
10-K - FORM 10-K ANNUAL REPORT 12-31-2009 - ASGN Incform10k.htm

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement Nos. 333-57078, 333-38849, 333-61998, 333-106203, 333-143907 and 333-148000 on Form S-8 and 333-88034, 333-134479 and 333-142382 on Form S-3 of our reports dated March 16, 2010 relating to the financial statements and financial statement schedule of On Assignment, Inc. (the "Company") and the effectiveness of the Company's internal control over financial reporting, appearing in this Annual Report on Form 10-K of On Assignment, Inc. for the year ended December 31, 2009.

/s/ Deloitte & Touche LLP

Los Angeles, California
March 16, 2010