On Assignment to Attend the UBS 2007 Business and IT Services Small and Mid Cap One-On-One Conference

Business Wire, July 23, 2007

CALABASAS, Calif. -- On Assignment, Inc. (NASDAQ:ASGN), a diversified professional staffing firm providing flexible and permanent staffing solutions in specialty skills including Laboratory/Scientific, Healthcare/Nursing/Physicians, Medical Financial, Information Technology and Engineering, today announced that President and Chief Executive Officer Peter Dameris is scheduled to attend one-on-one meetings on August 14, 2007, at the UBS 2007 Business and IT Services Small and Mid Cap One-On-One Conference in Boston, MA.

Slides for the updated investor presentation will be available on the Company web site at www.onassignment.com in the Investor Relations section under Events and Presentations. Through this link, visitors will be able to access the Company's presentation.

About On Assignment

On Assignment, Inc. (NASDAQ:ASGN), is a diversified professional staffing firm providing flexible and permanent staffing solutions in specialty skills including Laboratory/Scientific, Healthcare/Nursing/Physicians, Medical Financial, Information Technology and Engineering. The corporate headquarters is located in Calabasas, California. On Assignment, Inc. was founded in 1985 as Lab Support and went public in 1992. The company's branch network encompasses over 80 branch offices across the United States, United Kingdom, Netherlands, Ireland, Belgium, and also provides physicians in Australia and New Zealand.

Safe Harbor

Certain statements made in this news release are "forward-looking statements" within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended, and involve various risks and uncertainties. Forward-looking statements include statements regarding the Company's anticipated financial and operating performance in 2007. All statements in this release, other than those setting forth strictly historical information, are forward-looking statements. Forward-looking statements are not guarantees of future performance, and actual results might differ materially. In particular, Company makes no assurances that the estimates of revenues and earnings per share set forth above will be achieved. Factors that could cause or contribute to such differences include actual demand for our services, our ability to attract, train and retain qualified staffing consultants, our ability to remain competitive in obtaining and retaining temporary staffing clients, the availability of qualified temporary nurses and other qualified temporary professionals, management of our growth and integration of our completed acquisitions, continued performance of our enterprise-wide information systems, and other risks detailed from time to time in our reports filed with the Securities and Exchange Commission, including our Annual Report on Form 10-K for the year ended December 31, 2006, as filed with the SEC on March 16, 2007. We specifically disclaim any intention or duty to update any forward-looking statements contained in this news release.