Robert Rowling

In 1996 he reinvested $500 million from selling the family's oilfields into the purchase of Omni Hotels. The Omni chain has 60 locations and 21,000 rooms nationwide with big new hotels in Dallas, Atlanta and Boston. In 2004 Rowling bought Gold's Gym, which Arnold made famous; it now has more than 700 locations worldwide. He gave $25 million to the University of Texas business school in 2013.