Jack Gordon Westrope (January 18, 1918 - June 19, 1958) was an American Hall of Fame jockey in Thoroughbred horse racing.Born in Baker, Montana, Westrope was the son of racehorse owner/trainer W. T. Westrope. Jack was only 12 years old when he rode his first winner on a small track in Lemmon, South Dakota. By age 15, while still officially an apprentice jockey, he was the leading rider in the U.S. for 1933.