Kelly Services is an American temporary staffing agency founded in 1946 by William Russell Kelly. It provides human resources consulting, outsourcing, recruiting, career transition, and vendor management services. Kelly Services operates in 41 countries and territories, employing over 530,000 individuals annually in fields such as office services, accounting, engineering, IT, law, science, marketing, and healthcare. In 2012, Kelly Services reported $5.551 billion in revenue.