Loupot moved to Paris in 1923 and began working for
Maison Devambez. His innovative posters for the automobile company
Voisin quickly established Loupot as a pioneering figure on the design scene. In the same year,
A. M. Cassandre - with whom Loupot would later collaborate - produced 'Le Bûcheron', also representing a radical departure from the established
Art Nouveau style. Loupot and Cassandre, along with
Paul Colin and
Jean Carlu, were nicknamed the 'Musketeers' by critics, and seen to be ushering in a new era of poster design. Loupot was chosen as one of the four official poster artists to represent the 1925
International Exhibition of Modern Decorative and Industrial Arts (French:
Exposition internationale des arts décoratifs et industriels modernes). The other artists included France's pre-eminent sculptor and draughtsman
Antoine Bourdelle. The 1925 exhibition attracted 16 million visitors, and fundamental in establishing the
Art Deco style, then known as the
Style Moderne. Loupot started to attract prestigious clients, such as the Maison des Vins Nicolas and
Eugène Schueller. Loupot married a second time to Jane Alfassa, with whom he had a son, Jean-Marie, in 1926. Along with many of the major decorative artists and architects of the time, Loupot joined the
French Union of Modern ArtistsUnion des artistes modernes), in 1929. Emphasising the importance of design, the group aimed to create beautiful, affordable pieces that could improve the quality of people's lives. Cassandre was also a part of the union, and the following year Loupot and Cassandre joined forces to create the Alliance Graphique. The collaboration ended in 1934, Loupot continued to work for a range of clients, and in 1936 met Max Augier, head of advertising for the drinks company . This partnership lasted for over 20 years, with few creative restrictions imposed on Loupot's design. For the
Exposition Internationale des Arts et Techniques dans la Vie, an important opportunity to showcase Loupot's new designs, Max Augier organised not only an entire pavilion, but also the exclusive right to advertise on the surrounding walls of the exhibition. Although resident in Paris, Loupot was also a great lover of the countryside. On a visit to the village of Chevroches, near Clamency, he spontaneously bought a house in the neighbourhood. Around this time Loupot met France Pier, who would become his lifelong companion, although they never married. Loupot later designed murals for a chapel in the vicinity, and there is a
permanent inscription dedicated to him at Chevroches. == Break during WWII ==