Anthony Joseph Drexel Biddle I (1874–1948) was an eccentric millionaire whose fortune allowed him to pursue theatricals, self-published writing, athletics, and Christianity on a full-time basis.He was the man upon whom the book My Philadelphia Father and the play and film The Happiest Millionaire were based.
He trained men in hand-to-hand combat in both World War I and World War II, was a fellow of the American Geographical Society and founded a movement called "Athletic Christianity" that eventually attracted 300,000 members around the world.
A 1955 Sports Illustrated article called him "boxing's greatest amateur" as well as a "major factor in the re-establishment of boxing as a legal and, at that time, estimable sport."