He met Apollinaire, Jarry and Fort together in a Latin Quarter bar; then via them met Picasso, who immediately introduced him to his friend Jacob, the three becoming lasting friends. Mac Orlan, met in another bar, and Apollinaire both collaborated with him. Among the group congregating around Kisling’s studio, he became a friend and colleague of Chagall and Rousseau. Fargue, an old friend, paid Salmon to ghost for him when he was forbidden to publish during WWll. He helped support Péret and Radiguet among many others, and interviewed Unamuno just before the philosopher killed himself.