 He left Morgan Stanley in 1977 and moved to Houston to form an oil and gas company, Austin Resources Corporation, and a bank holding company, with Ned Holmes, which became Prosperity Bank, one of the largest Texas based banks.In 1980, Bryan moved back to New York to partner with Jan Stenbeck and set up a company, Millicom, to operate voice and data distribution which became cellular telephony.Bryan served as president of Millicom from 1981-1994.