Jacques Dupont became French military champion on the road in 1948 and national champion of amateur e in track tracking. At the 1948 Summer Olympics in London , Dupont competed both in road races and on the track, where he won the gold medal in the 1000 m time trial . In the team classification of the road race, the French line-up with Dupont, José Beyaert and Alain Moineau won the bronze medal. Dupont was again French champion in the single pursuit in 1949 and then switched to the professional cyclists.
As a professional, Dupont won numerous races, including the French road championship in 1954 and the classic Paris-Tours bike in 1951 and 1955 . With the average speed of 43.666 km / h achieved in his Paris Tours victory in 1955, he became the new bearer of the Yellow Ribbon . In his hometown a street was named after him. In 1960 he ended his career and then worked as a butcher.