EXHIBIT 21.1 SUBSIDIARIES OF STAFFMARK, INC. SUBSIDIARY STATE OR COUNTRY OF ORGANIZATION Brewer Personnel Services, Inc. Arkansas The Blethen Group, Inc. d/b/a Clinical North Carolina Trial Support Services First Choice Staffing, Inc. South Carolina HRA, Inc. Tennessee Tom Bain Personnel, Inc., a subsidiary of Tennessee HRA, Inc. Maxwell Staffing, Inc. Oklahoma Maxwell/Healthcare, Inc. Oklahoma Maxwell Staffing of Bristow, Inc. Oklahoma Square One Rehab, Inc. Oklahoma Technical Staffing, Inc. Oklahoma Prostaff Personnel, Inc. Arkansas Excel Temporary Staffing, Inc. Arkansas Professional Resources, Inc. Arkansas The Technology Source Acquisition Corporation Delaware d/b/a Technology Source, Inc. Advance Personnel Service Acquisition Corporation Delaware d/b/a Advance Personnel Service, Inc. StaffMark Acquisition Corporation Two Delaware StaffMark Acquisition Corporation Three Delaware StaffMark Acquisition Corporation Four Delaware StaffMark Acquisition Corporation Five Delaware StaffMark Acquisition Corporation Six Delaware 533993 B.C., LTD. British Columbia MRIC - Medical Recruiters International LTD., British Columbia a subsidiary of 533993 B.C., LTD.