Kelly Services, Inc. (formerly Russell Kelly Office Service and Kelly Girl Service, Inc.) is an American office staffing and workforce solutions company that operates globally. The company places employees at all levels in various sectors including the financial services, information technology, and law industries. It also offers professional services, including human resource and management consulting, outsourcing, recruitment, career transition, and vendor management services. Kelly Services was founded by William Russell Kelly in 1946 and is headquartered in Troy, Michigan. In 2015, the company reported 8,100 employees, $5.5 billion in revenue, and placed 550,000 employees to work in positions in various sectors, making it one of the world\'s largest staffing firms.