 In 1914 he fought Jack Johnson for the Heavyweight Championship of the World, and in 1916 "The Fighting Dentist" went up against Jess Willard for the same title, but lost both bouts.He lost his last fight to Marcel Nilles for the Heavyweight Championship of France on December 22, 1922.He retired from boxing after 66 bouts with a record of 36 wins (28 by a knockout), 13 losses, 16 draws and 1 no contest.