Sam Mosberg won the Olympic Lightweight (135 pounds) Championship at the 1920 Games in Antwerp, Belgium. En route to his gold medal, Mosberg scored what historians list as the quickest knockout in Olympic boxing history, finishing an opponent in a matter of seconds.

In a career that began in 1912, Mosberg fought 250 amateur fights prior to turning pro after his Olympic victory. He retired in 1923 with 57 professional fights under his belt, enjoying limited success. Said Spike Webb, perennial U.S. Olympic boxing coach during the first half of the twentieth century: “Sammy Mosberg is the greatest Olympic champion I ever coached.” Webb’s Olympic protégés include Jackie Fields, Fidel LaBarba, and Frankie Genaro—all gold medalists who went on to become professional World champions.

Mosberg coached the United States boxing team at the 1953 Maccabiah Games.