Bertold Haag was born in Mannheim (Baden-Württemberg) in 1912. In 1929 he participated for the first time in an exhibition at the Kunsthalle Mannheim. He broke off his studies of philosophy and architecture in Heidelberg and Karlsruhe to work as a freelance artist. In 1936 he had a solo exhibition at the Kunsthalle Mannheim. In 1938 he moved to Berlin. In 1951 he had a large solo exhibition at the Rathaus Schöneberg in West Berlin. Haag died in Berlin in 1981.