John Marlan Poindexter is a retired United States naval officer and Department of Defense official. He was Deputy National Security Advisor and National Security Advisor for the Reagan administration. He was convicted in April 1990 of multiple felonies as a result of his actions in the Iran–Contra affair, but his convictions were reversed on appeal in 1991. More recently, he served a brief stint as the director of the DARPA Information Awareness Office for the George W. Bush administration. He is the father of NASA astronaut and U.S. Navy Captain Alan G. Poindexter.