He started working on prototype aircraft at the aircraft maker Breguet. In 1938, he introduced lightweight aluminum bicycle components: pedals, cranks, cantilever brakes and stems. In 1940, he began making complete bicycles.
Herse was a "constructeur", meaning he built not just the frame but the entire bike.
His hand-built bicycles were described as "the pinnacle of French cycling" from the 1940s until his death. Herse died in Paris.
Six out of ten victories has never been equalled.
His frames were ridden to victory by racers including Louison Bobet.