#10. David Koch
A Chemical Engineer, Philanthropist, Influential Libertarian and also the Executive Vice President of Koch Industries, which is the second largest privately held company in America. David has a net worth of $42 billion, he became the President of the Subsidiary Division in 1979 and then later became a Co-owner of Koch Industries along with his older brother Charles. Today they each own 42% of Koch Industries along with oil refineries in Texas, Alaska, and Minnesota and they control 4,000 miles of pipeline.