ROBERT M. GATES served as secretary of defense under both President George W. Bush and President Barack Obama. He was also an officer in the United States Air Force and worked for the CIA before being appointed director of the agency. He served eight presidents of both political parties and was a member of the National Security Council staff in four administrations. He was president of Texas A&M University from 2002 to 2006, is currently chancellor of the College of William & Mary, was named president of the Boy Scouts of America in 2013, and has served on several corporate boards of directors. Less