A high school dropout, Foreman learned to box in the Job Corps. In 1968 he was the Olympic heavyweight gold medalist. Foreman beat Joe Frazier for the world heavyweight crown in 1973 and defended the title twice before losing to Muhammad Ali. He retired to the ministry in 1977, but launched a comeback in 1987, losing a title fight at age 43. In 1994 Foreman knocked out Michael Moorer to win the World Boxing Association (WBA) and International Boxing Federation (IBF) titles and become the world's oldest heavyweight champion, but he was stripped of the WBA crown in 1995 and relinquished the IBF title the same year.