From April 5, 1915 to July 4, 1919 - Heavy weight boxing champion - Jess Willard ( American )
Sonny Liston
Jack Johnson
rocky balboa
Wasn't Wladimir in as champion at that point(?)
Unfortunately there is no undisputed heavyweight champion.
wilfredo benitez
Jack Johnson
Muhammad Ali
Joe Louis...
Ingemar Johnasson
The current heavy weight champion of boxing is Vladimir Klitschlow. He is from the Ukraine and weighs 243 pounds, or 220 kilograms.