Martin “Marty” Edward Dempsey, is a retired United States Army general who served as the 18th chairman of the Joint Chiefs of Staff from October 1, 2011 until September 25, 2015, his ceremonial last day (de facto); in actuality, his last day was September 30, 2015 (de jure). He previously served as the 37th chief of Staff of the Army from April 11, 2011, to September 7, 2011. Before that, he served as Commanding General, U.S. Army Training and Doctrine Command, from December 8, 2008, to April 11, 2011, as Acting Commander, U.S. Central Command, from March 24, 2008, to October 30, 2008, as Deputy Commander, U.S. Central Command, from August 2007 to March 23, 2008, and as Commanding General, Multi-National Security Transition Command – Iraq (MNSTC-I), from August 2005 to August 2007. Dempsey assumed his assignment as Chairman of the Joint Chiefs of Staff on October 1, 2011 and stepped down from the Chairmanship on September 25, 2015. He has served as a professor at Duke University and as chairman of USA Basketball.

The chairman of the Joint Chiefs of Staff (CJCS) is the presiding officer of the Joint Chiefs of Staff (JCS). The chairman is the highest-ranking and most senior military officer in the United States Armed Forces and the principal military advisor to the president, the National Security Council, the Homeland Security Council, and the secretary of defense. While the chairman of the Joint Chiefs of Staff outranks all other commissioned officers, the chairman is prohibited by law from having operational command authority over the armed forces; however, the chairman assists the president and the secretary of defense in exercising their command functions.