Joe Louis held the Title from June 22, 1937 until he announced his retirement on March 1, 1949.
Joe Louis - 1937 to 1949
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Vladimir Klitschko is a Ukrainian heavyweight professional boxer. He is the longest reigning IBF, IBO & WBO heavyweight champion in the history of boxing. He is a younger brother to Vitali Klitschko who was the former WBC, WBO & Ring magazine heavyweight champion.
The "Easton Assassin" AKA Larry Holmes was the World Heavyweight Champion... Larry Holmes still holds the distinction today of being the longest reigning World Heavyweight Champion in boxing history (1978-1985), second only to Joe Louis
Muhammad ali
Mohamed Ali
Not at this time.
Rocky Marciano
Rocky Marciano is the only heavyweight champion not to loose a fight.
mike Tyson aged 20.
Of boxing...honestly, who cares anymore.
Joe Louis