sentences:  He worked closely with Joseph Albers, James Rosati and Paul Rudolph, and produced his monumental work, "Column," (1963) for Rudolph's new building for the Yale Art & Architecture program.Represented by Arthur and Madeleine Lejwa's influential Galerie Chalette in New York, his work attracted the attention of Joseph Hirshhorn, who began to actively collect Engman's sculptures.In 1964, Engman moved to Pennsylvania, where he became director of the University of Pennsylvania's graduate studies in sculpture.