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.
For the 1925 Exposition Internationale des Arts Décoratifs et Industriels Modernes in Parishe designed furniture for the Grand Salon of the French Embassy.
Montagnac served as President of the SAD for many years and organized their pavilion at the Exposition Internationale des Arts et Techniques dans la Vie Moderne in 1937.