In exile in Paris and New York he worked with various popular front publications. He wrote some chapters, dealing with the international linkages of the German NSDAP, in the widely read 1933 "Braunbuch über Reichstagsbrand und Hitlerterror" ('Brown Book on Reichstag Fire and Hitler Terror'). In 1940, he married Herta Fischer (1908–1990), and their son, Johnny, was born in October 1942. In October 1946 he returned to Berlin, where he became editor of the weekly "Deutschlands Stimme" ('Voice of Germany').