The sculptors Maillol, Laurens, Lipchitz and Gonzalez, as well as Braque and Kandinsky, were among the artists he met when he visited Paris; de Chirico and Severini were among his Italian friends there. Based in Switzerland during WWII he mixed with Richier and Giacometti (fellow-sculptors again), and later met Moore, with whom he enjoyed a particularly deep friendship. Arp, Calder, Beckmann and Dalí were met during a stay in America. Not widely noted for portraiture, he made busts of friends and colleagues Moore, Miller, Mies van der Rohe and Richier, and one of Stravinsky as soon as he met him.