CORRECTED: On Assignment, Inc. Schedules First Quarter 2004 Earnings Release and Conference Call.

Business Editors

CALABASAS, Calif.--(BUSINESS WIRE)--April 12, 2004

On Assignment, Inc. (Nasdaq: ASGN) will announce its 2004 first quarter financial results on Tuesday, May 4, 2004 after close of market and will hold its regular quarterly conference call Tuesday, May 4, 2004 at 2:00 p.m. PDT.

The dial-in number for this conference call is (800) 309- 8283 or [phone]. The call will be hosted by Joe Peterson, M.D., President and Chief Executive Officer, Peter Dameris, Executive Vice President and Chief Operating Officer and Ron Rudolph, Executive Vice President, Finance and Chief Financial Officer of On Assignment, Inc.

A replay of the conference call will be available beginning at 5:00 p.m. PDT on May 4, 2004 and will run through Thursday, May 13, 2004. The access number for the replay is [phone] or [phone] and the access code is 6040383.

This call is being webcast by CCBN and can be accessed at On Assignment's web site at www.onassignment.com.

About On Assignment

On Assignment is a leading international science and healthcare temporary staffing company, providing services in laboratory support, travel and local nursing, allied healthcare and medical-financial staffing. The corporate headquarters and Lab Support Division are located in Calabasas, California. The Healthcare Staffing Division operations are based in Cincinnati, Ohio.