Warren Buffett, known as the “Oracle of Omaha,” is the primary shareholder and CEO of Berkshire Hathaway. Buffett is also a notable philanthropist, having pledged to give away 85 percent of his fortune to the Gates Foundation. He also serves as a member of the board of trustees at Grinnell College. He has twice been named to The Directorship 100, the annual listing of the most influential people in corporate governance.