Universal Health Services is one of the largest hospital management companies in the United States. The company operates various subsidiaries, acute care and behavioral health hospitals and ambulatory centers. Founded in 1978, it maintains a staff of more than 38,000 employees. Universal Health Services is a publicly owned company that also operates various radiation oncology centers that provide a range of radiation treatment therapies and medical services for patients throughout the United States and Puerto Rico. In addition, its hospitals offer critical emergency care, surgery, 24-hour emergency and other health care services. The company is headquartered in King of Prussia, Pa.