 On television, he commentated on many of the major events of the racing year, including the Cheltenham Festival until 1994, The Derby until 1979, and the Grand National, Royal Ascot and Glorious Goodwood until he retired in 1997.During his career, he commentated on around 30 runnings of the Prix de l'Arc de Triomphe in Paris and racing from the United States and Ireland as well as trotting from Rome during the 1960s.During his 50 years of commentating on the Grand National, O'Sullevan commentated on numerous historic victories.