William Edward Simon (1927 – 2000) was a businessman, a Secretary of Treasury of the U.S. for three years, and a philanthropist. Outside of government, he was a successful businessman and philanthropist. The William E. Simon Foundation carries on this legacy. He was a strong advocate of laissez-faire capitalism. He wrote, "There is only one social system that reflects the sovereignty of the individual: the free-market, or capitalist, system".