William Muldoon was an infamous athlete whose prowess, savvy, and chicanery across his six-decade career led him to wealth, cultural importance, and political power. Muldoon, the child of poor Irish immigrants, began wrestling in the 1870s and quickly became one of the most famous athletes of the post–Civil War era. He started acting and modeling as his popularity grew, making him one of the first sports stars to achieve crossover success. After a triumphant stint rehabilitating fallen boxing heavyweight champion John L. Sullivan in 1889, he retired from the ring and began a new career as a fitness impresario, founding an elite gymnasium and remaking himself as a health authority in the press. He became trainer to the rich, famous, and politically powerful, which led to his appointment as chair of the New York State Athletic Commission in the 1920s. From this position, Muldoon exerted his influence over the rules of boxing and wrestling and weaponized his power to maintain segregation in sport.

The Last Gladiator: William Muldoon and the Making of American Sports (U Texas Press, 2025) is a deep, insightful dive into Muldoon’s life and impact, demonstrating the significance of this often-controversial figure in the development of American sports, professional wrestling, and physical and popular culture.

Paul Knepper covered the New York Knicks for Bleacher Report. His first book was The Knicks of the Nineties: Ewing, Oakley, Starks and the Brawlers That Almost Won It All. His next book, Moses Malone: The Life of a Basketball Prophet, will be out on November 1. You can reach Paul at paulknepper@gmail.com and follow him on Twitter @paulieknep.

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152. What you need to know: oral steroids