Behrens employed him (and his friends Mies van der Rohe and Gropius) as a young man. Hoffmann, Moser and Klimt were all met around the same time on a visit to Vienna. Braque, Picasso, Lipchitz, Gris and Léger were among artist friends and acquaintances in Paris after WWI. Ozenfant and he started a post-cubist artistic movement together. He met Meyerhold and Eisenstein on a trip to Moscow, and Baker on a voyage to Rio. Perriand worked in his studio designing furniture. He travelled across Spain with Léger, collaborated on a building with Sert, and on an electronic poem with Varèse.