Addison Group is a professional staffing and consulting firm that provides services in the areas of information technology, finance and accounting, healthcare, human resources, and administration. The company was founded in 1999 and is headquartered in Chicago, Illinois. Addison Group has over 2500 employees and operates in 22 locations across the United States. The company has been recognized as one of the fastest-growing private staffing firms in the United States by Inc. Magazine.