Born in Philadelphia in 1898, he died in New York in 1976. After getting his degree in engineering he attended courses on design. He went to Paris in 1926, where he exhibited his first sculptures made of metal wire to create clever animations. In 928 he got in touch with Miro', Leger, Arp and Mondrian while in 1931 he joined the "Abstract - Creation" movement and created first his Stabiles" and, later , his "mobiles". In 1953 he participated with some objects in the first exhibition organised by Fucina Degli Angeli.