From 1950 to 1955 he worked as an assistant at the Albertina in Vienna and was as visiting professor at Barnard College, Columbia University in New York.
He worked as an assistant at the Albertina in Vienna. This was from 1950 to 1955. He was as visiting professor at Barnard College. This was from 1950 to 1955. Barnard College was Columbia University in New York.