Although Roy Cullen had little formal education, he became one of the state’s greatest benefactors to higher education. To his favorite philanthropies, Cullen in one year (1952) gave $11 million to the University of Houston and hospitals in the area. By 1955 he had given away 90 percent of the vast fortune he had amassed in the oil business. Like Glenn McCarthy, he became known as the “king of the wildcatters,” in his case for drilling deep wells. The Cullen Foundation, founded in 1947 with $160 million, benefited educational and medical institutions.