His 16 ft bronze Alice In Wonderland climbing sculpture in Central Park is well known to both adults and children in New York City.
He was an early adopter, and prominent exponent of the direct carving approach to sculpture.
He also developed the technique of lead chasing, and was among the very first to create modern sculpture from found objects.
He taught at Black Mountain College, the Art Students League of New York, and the New School for Social Research.
His works are in the Whitney Museum, the Metropolitan Museum of Art, the Museum of Modern Art, the Smithsonian American Art Museum, and many other public and private collections.