Chassagne’s long career spans the early heroic road races as riding mechanic on Darracq, Clément-Bayard and Hispano-Suiza before he joined Sunbeam (later to become S.T.D.), where he achieved his most notable success as a racing driver, including winning the 1922 Tourist Trophy. Chassagne raced well into his forties with Bentley and others in Le Mans and elsewhere. His first Grand Prix was the very first French Grand Prix in Le Mans 1906. His last was in 1930, during which period he also was responsible for numerous speed records.