He worked as an assistant to Gance, helped Chagall find titles for his paintings, had his portrait painted by Modigliani, and strongly influenced Dos Passos, who translated his work into English. Milhaud composed for him (Léger did the sets), Braque decorated his car, and Sonia Delaunay, a lifelong friend, illustrated a celebrated piece of work. He drunk champagne with Stravinsky and Diaghilev after a woman broke a theatre seat over his head. Varèse, Desnos, Metzinger, Miller and Hemingway were also good friends. Satie, Auric and sometimes Jacob ate bouillabaisse together with him every Friday.