Adecco is a staffing agency and is the world leader in workforce solutions. Based in Tempe, Ariz., it offers services, such as managed services, permanent recruiting, temporary and contract staffing. The company operates in specialty areas, including information technology, medical and science, engineering and technical, and finance, to name a few. Adecco has affiliations with companies that include Society of Human Resource Management, American Institute of Certified Public Accountants, International Association of Administrative Professionals and World Business Forum.