Career
In 1913 Thesing joined Otto val Halem as partner and managing director of Veit and Company Following wartime propaganda collaboration with a German-Austrian publishers" association, Veit & Company was incorporated into Walter de Gruyter on 1 January 1919 – despite some political reservations from Thesing, who was on the political left. In May 1920 he withdrew as a partner from the firm for health reasons.