Born in Saint-Denis, France on 9 May 1883, Pierre-Paul Montagnac was equally talented as a fine artist and a decorative artist. He was educated in both disciplines, studying with Eugene Carriére as well as at the Académie de la Grande Chaumiére, both in Paris.
His inaugural exhibition was at the 1912 Salons – and at the 1920 Salon d’Automne he received a traveling scholarship. In 1918 he began working in the firm of André Mare and from 1922 collaborated with Maurice Dufrene at La Maîtrise, the famous design studio of Galeries Lafayette. From 1921 he exhibited at the Salons of la Société des Artistes Décorateurs, Salon des Architectes Modernes,
and internationally, in Barcelona and Leipzig. He designed suites on the grand French oceanliners, l’Atlantique, Normandie and Pasteur.
At the 1925 Paris International Exposition his work was in a standout class. At the 1937 Exhibition he organized the pavillion of the Artistes Decorateurs and personally won a Grand Prix. For the New York Exhibition in 1938, he was a member of the international jury, organized the group of Decorators, and, as architect, organized the exhibitions of jewelry and perfumes.
He became a member of the Society of Modern Architects and executed important and numerous architecture and decorating projects including the luxury apartments on the great French oceanliners l’Atlantique, Pasteur, and Normandie.