John Hare Park Jennings, popularly known as Jack Jennings, was born on 8 February 1890. Though English by birth, he was based in France for the vast majority of his career and achieved several major victories there.
The son-in-law of successful National Hunt jockey and Grand National-winning trainer Harry Escott, Jack served his apprenticeship in England and held a professional jockey’s licence in 1907, without riding a winner, before leaving to pursue his career in France.
He registered his first important success there on Hag To Hag in the 1909 Prix Du Conseil Municipal. The following year he won his first Classic on Vellica in the Poule d’Essai Des Pouliches (French 1,000 Guineas). In 1912 he finished second on Wagram II in the Grand Prix De Paris, beaten by Frank Wootton on Houli.
Jack returned to England soon after the First World War had begun and held a licence for the three seasons from 1914 to 1916, riding a total of seven winners, all of them trained by Harry Escott. The first was on Philanthropist in the Welbeck Selling Handicap at Nottingham on 6 October 1914, the last on Ragtime King in the Long Course Selling Plate at Newmarket on 11 April 1916.
After the war he went back to France and gained his first major success since his return on Tullamore in the 1920 Grand Prix de Deauville.
In 1921 he won a second Prix du Conseil Municipal, this time on Flechois. The following year he won the Prix de Diane (French Oaks) on Pellsie and finished second on Flechois in the Prix de l’Arc de Triomphe.
In 1923 he rode Filibert De Savoie to win the Grand Prix de Paris and the Prix Royal Oak (French St Leger). They started favourite for that year’s Prix de l’Arc de Triomphe. Filibert De Savoie had a very long action which forced his jockey to employ front running tactics to prevent him from striking into the heels of horses ahead of him. Massine, partnered by Fred Sharpe just had the edge over him all the way up the straight and looked the certain winner, only to be collared near the line by the English raider Parth, the mount of Frank O’Neill, who won by a neck from Massine with Filibert De Savoie just a further neck back in third.
In 1924 Jack won two more French Classics: the Poule d’Essai Des Pouliches on Rebia and the Prix de Diane on Uganda. He finished second in the Ascot Gold Cup on Filibert De Savoie, beaten a short head by fellow French challenger Massine, ridden by Fred Sharpe.
There were no more major successes. Having retired from the saddle, Jack Jennings remained in France for the remainder of his life. He died in Paris in 1985, aged 89.
His English winners were, in chronological order:
1. Philanthropist, Nottingham, 6 October 1914
2. Ragtime King, Windsor, 7 November 1914
3. Ragtime King, Warwick, 24 November 1914
4. Pollen, Sandown Park, 22 April 1915
5. Foxton, Newmarket, 2 September 1915
6. Unnamed gelding by Simon Square out of Isabelita, Gatwick 25 March 1916
7. Ragtime King, Newmarket, 11 April 1916