July 11, 1953
On January 15, 1977, in Las Vegas, he technically knocked out Bob Smith in 5 rounds.
won the world title
On February 15, 1978, he defeated Muhammad Ali by majority decision in 15 rounds and took the WBC and WBA heavyweight titles from him.
Lost His Title
In his first defense, on September 15, 1978, in a rematch with Muhammad Ali, who defeated him by unanimous decision.
On December 4, 1995, he was defeated by Fred Houpe via unanimous decision.