Clarence Thomas is an American lawyer and jurist who has served as an associate justice of the Supreme Court of the United States since 1991. Nominated by President George H. W. Bush to succeed Thurgood Marshall, Thomas is the second African American to serve on the U.S. Supreme Court and the second longest-serving U.S. Supreme Court justice in history. Born: June 23, 1948 In office: October 23, 1991 – present Wiki link