William Flynn Martin (born October 4, 1950) is an American energy economist, educator, and international diplomat. Martin served as Special Assistant to Ronald Reagan for National Security Affairs, Executive Secretary of the United States National Security Council, and United States Deputy Secretary of Energy during the Ronald Reagan Administration. He was President of the Council of the University for Peace, appointed to the Council by Secretary General of the United Nations Kofi Annan. In 1992, he was Executive Director of the Republican Platform committee under George H. W. Bush.William Martin served for ten years (from 2000 to 2010) as Chairman of the Nuclear Energy Advisory Committee during the administrations of George W. Bush and Barack Obama.