Stephen John Hadley is an American attorney and senior government official. He served as the 20th United States National Security Advisor from 2005 to 2009 under President George W. Bush during the second term of his administration. Prior to this, Hadley was Deputy National Security Advisor during Bush's first term.
Hadley's extensive government career includes serving as Assistant Secretary of Defense for International Security Policy from 1989 to 1993 during the administration of George H. W.