Triple Crown series:Preakness Stakes (2019)Belmont Stakes (2019)Mark E. Casse (born February 14, 1961) is a Thoroughbred racehorse trainer whose most notable horses include 2015 American champion turf mare Tepin and Canadian Horses of the Year Sealy Hill (2007), Uncaptured (2012), Lexie Lou (2014), Catch A Glimpse (2015) and Wonder Gadot.

He received a Kentucky trainer's license at age 18 and won his first race at Keeneland with Joe’s Coming on April 14, 1979.

[2] In the 1990s, Casse became the private trainer of Harry Mangurian and ran Mockingbird Farm,[8] which at the time had 900 horses in the Ocala area.

Manguarian dispersed most of his stock in 1999 and 2000, and the farm was bought by Eugene Melnyk, who renamed it Winding Oaks and become one of Casse's majort clients.

Two years later, Exciting Story would also earn Casse his first Grade I stakes win, the Metropolitan Handicap, at odds of 56-1.

[2] Casse had developed a reputation for training good two-year-olds and selling them once they won, which kept him from winning most major races.

In 2008, Sealy Hill would finish second in the Breeders' Cup Filly and Mare Turf and was eventually inducted into the Canadian Horse Racing Hall of Fame.

[9] In 2011, Casse won his fifth straight training title at Woodbine Toronto with a record 119 victories, which was nearly double the number of wins compiled by the runner-up.

[13] On July 6, 2014, Casse scored his first victory in the Queen's Plate, Canada's premier race, with filly Lexie Lou.

[17] Other major graded stakes winners included World Approval, Lexie Lou, Kaigun, Catch A Glimpse, Noble Bird and Pretty City Dancer.

[15] At the 2016 Breeders' Cup, Classic Empire established himself as a leading contender for the 2017 Kentucky Derby by winning the Juvenile.