 The chief pilot for the French Wright Company, Lefebvre was a participant in the first international air race, the Grande Semaine d'Aviation at Reims in 1909, piloting a Wright Flyer.He, Louis Blériot and Hubert Latham were selected as France's representatives during the contest for the Gordon Bennett Trophy on 22 August, after poor weather made the morning's planned qualifying run impossible.When the weather lifted around 6 o'clock that evening, Lefebvre was one of the pilots who took to the sky in an exhibition, giving one of the earliest displays of stunt flying.