Inspector General of Bridges and Roads (Ponts-et-Chaussées), a great specialist in reinforced concrete, he designs works of art of all kinds such as the Jean Bart form in Saint-Nazaire, the Donzère bridge (prototype cable-stayed bridge). It devotes a significant part of its activity to aeronautics; designer of the famous Caquot observation balloons (1914) ensuring the superiority of the Allies in this area. Technical director of aviation in 1918, his action brought France to the forefront for the number of aircraft manufactured. Creator of the Air Museum. Member of the Aeronautical Propaganda Committee in 1927, he created the Institute of Fluid Mechanics (Institut de mécanique des fluides). President of the National Aviation Construction Societies from 1938 to 1940. Professor at the School of Bridges and Roads (École des Ponts et Chaussées), School of Mines (Ecole des Mines) of Paris and Superior Aeronautical School (Sup’Aéro), member of the Institute (Academy of Sciences) in 1934 and president of numerous associations and societies