Warren A. Croll, Jr. (March 9, 1920 – June 6, 2008), best known as Jimmy Croll, was an American Hall of Fame Thoroughbred race horse trainer. Croll was born in 1920 in Bryn Mawr, Pennsylvania. After finishing high school, he attended the University of Pennsylvania with the intention of becoming a veterinarian but left to pursue his passion for racing Thoroughbreds. In 1940 he obtained his trainers' license but his racing career was interrupted by service with the United States Army in the Pacific Theater of Operations during World War II. Upon the 1946 opening of the new Monmouth Park Racetrack in Oceanport, New Jersey, Croll relocated there and became a permanent part of that facility's annual summer campaign. In 1998, he received Monmouth Park's "Raines Distinguished Achievement Award" g