On Assignment, Inc. Announces Management Changes: Chief Executive Officer Joe Peterson Resigns from the Company, Staffing Industry Veteran Peter Dameris Promoted to Position of President and CEO.

CALABASAS, Calif. -- On Assignment, Inc. (Nasdaq: ASGN), a leading provider of specialty temporary staff for science and healthcare, today announced the following management changes. Joe Peterson, On Assignment's Chief Executive Officer since 2001, has informed the Board of Directors that he is leaving the Company effective today. Peter Dameris, On Assignment's Executive Vice President and Chief Operating Officer since November 2003, will assume the position of President and CEO. Mr. Dameris is a staffing industry veteran with extensive executive experience with public companies, including Quanta Services Inc. as EVP and COO and Metamor Worldwide Inc. as Chairman and CEO.

Joe Peterson commented, "I feel comfortable with the transition at this time knowing that On Assignment's businesses are strengthening, revenues are growing without sacrificing our strong margins, and the Company's balance sheet remains solid. I am pleased with my selection of Peter Dameris to complete the Company's turnaround. With the top notch management team Peter has hired in the last several months, I am leaving the Company in very capable hands."

"We are pleased with the evolution of On Assignment and its management team," said Jeremy Jones, Chairman of the Board of On Assignment, Inc. "In the past year Peter has proven that he is capable of leading the Company as President and CEO. Peter's years of public company and staffing experience will enable us to continue to manage internal operations, exploit opportunities and execute on our priorities. With the senior management team he brought on board continuing to report to him, this should be a seamless transition for the Company. On behalf of the entire Board of Directors, we would like to thank Joe for his leadership over the last three years, which has positioned On Assignment well for the future."

Peter Dameris, President and CEO of On Assignment commented, "The positive trends we are seeing in our business lines are the direct result of steps taken earlier in the year under our Revitalization Plan. As we said previously, the third and fourth quarters of 2004 are important measurement periods for improvements in our revenues, gross profits and staffing consultant productivity as we remain focused on optimizing our income generating capabilities going forward. Our senior management team has over 50 years of specialty staffing industry experience which I believe will serve the Company and its shareholders well."

Dameris continued, "We have experienced solid growth in Lab Support and MF&A during the third quarter of 2004, and Nurse Travel has remained stable. The average number of temporary professionals on billing for the month of September is projected to be at the highest level of any month in 2004." Dameris concluded, "On behalf of the Company and all of our employees, we thank Joe for his contributions over the years."

About On Assignment

On Assignment, Inc. is a leading international science and healthcare temporary staffing company providing services in laboratory support, nursing, and medical, financial and allied healthcare staffing. The corporate headquarters are located in Calabasas, California. On Assignment, Inc. was founded in 1985 as On Assignment/Lab Support and went public in 1992. The company's branch network encompasses 59 branch offices across the United States, the United Kingdom, The Netherlands, and Belgium. On Assignment, Inc.'s common stock is traded on the Nasdaq Stock Market under the symbol ASGN.

Safe Harbor 

Mr. Dameris' statements regarding our financial and operating performance in the third quarter of 2004 are "forward-looking statements" within the meaning of Section 21E of the Securities Exchange Act of 1934 and Section 27A of the Securities Act of 1933, and involve a high degree of risk and uncertainty. His statements regarding such performance are based upon estimates and certain assumptions. We will report our actual performance for the full quarter after our financial statements have been reviewed by our internal accounting staff and our independent auditors. Our actual results might differ materially from our estimates. Factors that might contribute to such differences include: 1) the actual number of employees on temporary assignment during the last two weeks of the third quarter and 2) the hourly billing rates associated with these assignments. We specifically disclaim any intention or duty to update any forward-looking statements contained in this news release.