No. 28 Malone Mitchell 3rd
This Far West Texas native met his wife Amy while both were undergraduates in Stillwater at Oklahoma State. After receiving their degrees, the two founded Riata Energy in their guest bedroom with $500 in startup capital. Two decades later, the Mitchells sold their interest in Riata Energy to Chesapeake Energy cofounder Tom Ward for $500 million. Riata was renamed SandRidge, and the company then acquired Carl Icahn’s National Energy Group for $1.5 billion. The Mitchells sold their remaining SandRidge shares in 2007. Their 350,000-acre Longfellow Ranch sits west of Malone’s hometown of Sanderson in the heart of the Trans-Pecos and features world-class elk and mule deer hunts.