sentences:  He taught at the Worcester Art Museum (1936–38) and the University of Iowa School of Art and Art History (1938–41) while pursuing his degree.In 1941 he married Dora Jane Heineberg (1916–2002), an art history student at Radcliffe College who later colloborated with him as co-author, and he became a citizen in 1943.Janson taught at Washington University in St. Louis from 1941 until 1949, when he joined the faculty of New York University, where he developed the undergraduate arts department and taught at the graduate Institute of Fine Arts.