_Hailing from one of Texas horse racing's most accomplished families, Asmussen was an international superstar as a jockey. An Eclipse Award winner as Best Apprentice Jockey in 1979, he shifted his tack to France in 1982, where he was a five-time champion jockey. Over the course of his career, Asmussen rode the winners of over 3,000 races.


As a jockey, Asmussen scored major wins in such top internationl races as the Prix de l'Arc de Triomphe (Fr-I), Breeders' Cup Mile (Gr. IT), French Derby (Fr-I), Japan Cup (Jpn-I), Irish Derby (Ire-I), French 1000 Guineas (Fr-I), French 2000 Guineas (Fr-I), Washington DC International (Gr. IT), Turf Classic (Gr. IT), Coaching Club American Oaks (Gr. I), Mother Goose Stakes (Gr. I), and Hong Kong Cup (HK-I).


Asmussen rode such champions and top horses as Montjeu, Hernando, Dream Well, Dear Doctor, Spinning World, Suave Dancer, In the Wings, Northern Trick, Soviet Star, Polish Precedent, Kingmambo, April Run, and Mairzy Doates.


Asmussen is currently a successful bloodstock agent and owner of Cashmark Farm.