Casse is a trainer and the founder of Casse Racing based in Ocala, Florida. He has been inducted into both the Canadian Horse Racing Hall of Fame and the National Museum of Racing Hall of Fame. His 3,000+ wins include Breeders’ Cup races and the Queen Anne Stakes at Royal Ascot. Casse has won 14 Sovereign Awards for outstanding trainer in Canada and has been the leading trainer at Woodbine Racetrack 14 times. In 2019, he won his first American Classic with War of Will in the Preakness Stakes. He also won the Belmont Stakes that year.