Niall M. O’Callaghan (born May 21 1963 in County Cork Ireland) is an American Thoroughbred horse trainer.O’Callaghan became involved in the sport of Thoroughbred horse racing as an apprentice jockey in his native Ireland. In 1982 he emigrated to the United States where he studied at Miami Dade Community College in Florida. In 1988 he went to work as an assistant to trainer Thomas J. Skiffington Jr.
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