 Henry's "theory, design and execution" of twin-cam engines was to guide engine development in Europe and then around the world for the next century.After studying Applied Mechanics at Technicum (School of Engineering) in Geneva, Ernest Henry worked starting in 1906 on marine engines for Picker of Geneva, then moved to Paris in 1909, serving the Motos Labor manufacturing company (marine and aviation engines), before joining the ranks of Peugeot in 1911.Robert Peugeot integrate it shortly after the team called "Les Charlatans" (a name given to the team by technical managers at the Peugeot factory in Beaulieu and who were opposed to this conception of race car), then composed the official Peugeot drivers Jules Goux, Georges Boillot and Paul Zuccarelli, who had left Hispano-Suiza.