 During the twelve Nazi years he worked for a succession of publishing businesses, at one stage employed as the Chief Executive Officer ("Geschäftsführer") of Otto Schwartz & Co in Göttingen.The doctorate he had received in 1923 had pointed the way for a future academic career, and after an unusually varied career in public service, local politics, and the private sector, Weisser returned to the academic world, obtaining a habilitation (higher academic qualification) from Rostock University in 1943 for a piece of work which was published only six years later, in 1949, under the title "Structure and nature of individual economies.Theory and strategy of their approaches" (""Form und Wesen der Einzelwirtschaften.