Warren Mehrtens (November 5, 1920 - December 30, 1997) was an American Thoroughbred horse racing jockey best known for winning the U.S. Triple Crown in 1946.Born in Brooklyn, New York, Warren Mehrtens graduated from Jamaica High School in 1938. Growing up near Aqueduct Racetrack he was a fan of Thoroughbred racing and after finishing school pursued a career as a professional jockey. Under the guidance of future U.S.