Maximilian Adelbert Baer was an American professional boxer and the world heavyweight champion from June 14, 1934, to June 13, 1935. He was known in his time as the Livermore Larupper and Madcap Maxie. Two of his fights were rated Fight of the Year by The Ring magazine. Baer was also a boxing referee, and had occasional roles in film and television. He was the brother of heavyweight boxing contender Buddy Baer and father of actor Max Baer Jr. Baer is rated #22 on The Ring magazine's list of 100 greatest punchers of all time.

Maximilian Adolph Otto Siegfried Schmeling was a German boxer who was heavyweight champion of the world between 1930 and 1932. His two fights with Joe Louis in 1936 and 1938 were worldwide cultural events because of their national associations. Schmeling is the only boxer to win the world heavyweight championship on a foul.