Joe Louis was World Heavyweight Champion from 1937 to 1949.
The champion from each weight class in each boxing organization.
From April 5, 1915 to July 4, 1919 - Heavy weight boxing champion - Jess Willard ( American )
darren williams
Unfortunately there is no undisputed heavyweight champion.
Wasn't Wladimir in as champion at that point(?)
Jack Johnson
rocky balboa
Sonny Liston
Jack Johnson
wilfredo benitez
Ingemar Johnasson
Muhammad Ali