Alan B. Miller got into the hospital business in the Philadelphia area in 1969 after a friend asked him to join a new hospital company, American Medicorp. The day after that company was purchased in a hostile takeover in 1978, Miller started Universal Health Services Inc., with a similar philosophy of operating hospitals in fast-growing areas. Last year, its revenue was $4.7 billion, and Miller calls his company's recent performance "spectacular." UHS has 25 acute-care hospitals and 107 behavior health hospitals.