George H W Bush is the oil Bush, after serving in WWII and graduating from Yale he moved his family to West Texas to work for Dresser Industries, an oil supply and services company, as a sales clerk. Dresser was owned by Brown Brothers Heriman, investment bankers, were his dad Prescott worked. HW left to become a wildcatter, with a partner founded Zapata Petroleum where he became a millionaire prior to entering politics.