Born Cassius Clay on Jan. 17, 1942, Ali changed his name in 1964 after joining the Nation of Islam. He converted to Sunni Islam in 1975.
Widely regarded as one of the greatest heavyweight boxers in the history of the sport, Ali became world heavyweight champion at the age of 22. As of 2014, Ali is the only lineal three-time heavyweight champion in history. He retired with an impressive record of 56 wins and 5 losses, with 37 of his victories by KO.Learn more about Athletes