Born into a prominent London, England family, he was always known by his middle name, Jeremy. His father was Ronald Tree, an American-born British journalist, investor and Conservative Member of Parliament (MP) for the Harborough constituency in Leicestershire. His mother, Nancy Lancaster, was a niece of the MP Nancy Astor through whom young Jeremy would be introduced to the sport of Thoroughbred racing.
Jeremy Tree embarked on a career in racing in 1947. He began training on his own at Newmarket Racecourse in 1952 then the following set relocated to stables at Beckhampton, Wiltshire. He won his first Classic in 1963 when Only for Life captured the 2,000 Guineas Stakes. His went on to win three more Classics, taking the Epsom Oaks with Juliette Marny in 1975 and Scintillate in 1979, then a second 2,000 Guineas Stakes in 1980 with Known Fact. Among his other top runners, Jeremy Tree trained Rainbow Quest to wins in the 1985 Coronation Cup and the Prix de l'Arc de Triomphe.
During his career, Jeremy Tree conditioned horses for prominent owners such as Charles W. Engelhard, Jr., Prince Khalid Abdullah and American John Hay Whitney.
After forty-three years in racing, Jeremy Tree retired in 1989 to his home in Beckhampton.
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