Wise Staffing Group | 5,004 followers on LinkedIn. Headquartered in MS, we are a full-service human resource company specializing in temporary and career staffing. | Wise Staffing Group, headquartered in Mississippi, is a full service human resource company specializing in temporary and career staffing with an emphasis on providing excellent customer service. Wise Staffing Group has become one of the largest staffing services in the Southeast. With 48 offices, Wise Staffing Group consists of Wise Staffing Services, Inc., Labor Source, One Source, and Wise Medical Staffing Inc.