Robert (Bob) Hanf was a son of Joseph Hanf and Laura Romberg. In 2007 a book was published on his life and work:
W. van der Beek et al., Bob Hanf, 1895-1944 : veelzijdig kunstenaar (Zwolle 2007)
Robert Hanf was the son of Joseph Hanf, who had fled from Germany. He was known as Bob. His father was friends with Breitner, who discovered that Robert Hanf was talented at drawing. He studied chemistry a…