John Edward Leach - always known as Jack - was born at Newmarket on November 19, 1901. The son of trainer Felix and brother of 'Chubb', he rode some 500 winners including the 20/1 Two Thousand Guineas hero Adam's Apple in 1927.
He always rated Diomedes, on whom he won The Portland Handicap. the best he rode. It was certainly a remarkable performance. The three-year-old, carrying 9st 2lb, raced full into a headwind, yet still broke the track record.
Jack was a charming and companionable individual but sadly lacked self-discipline.
During the First World War, he served as a captain with the York & Lancaster regiment.
Having been forced out of the saddle by increasing weight, he took up training at Graham Place, Newmarket: Fred Astaire was one of his patrons.
Jack also owned the 1934 Stewards' Cup winner, Figaro.
In 1933, Figaro was due to run in the first race at a Windsor meeting. A team of Cambridge undergraduates and Sandhurst cadets went to Eton to play against the boys. One member of the side was a friend of Jack's and passed on a tip for Figaro to all the players.
En masse, they arrived at Windsor racecourse and punted heavily on the horse. In a desperate finish, yelled home by the boys, Figaro won by a head at 12/1. The young students left with their pockets stuffed with £5 notes.
After the war, Jack resumed training. He won the Prix Morny with Delerium, proving he had the skill to be a successful trainer. But he did not have the temperament and gave up in 1952.
Then he discovered a talent for writing.
He had a racing column in both the Observer and the Sporting Life and wrote a book in 1961 about his life entitled 'Sods I Cut On The Turf'.
His unreliability, however, was the despair of his editors and he began losing work.
Aged 70, Jack died on Saturday January 29 1972 - just a few hours after the death of Harvey (Jack) Leader, for whom Jack had often ridden.
Jack has two jockey brothers: Henry Beresford (1908 - 1970) and Felix Jnr (1899 - 1930). Henry retired when only 22 and Felix Jr. died in 1930 during an operation for appendicitis.