 He moved to Stockholm and in the summer of 1947 to Paris, working for a newspaper and the Centre pour l'Histoire des Juifs Polonais, where he met Léon Poliakov, the French historian.In 1952 he and his wife moved to Berlin.Steven Lehrer writes that Wulf "cut an unmistakeable figure ... [h]e dressed impeccably, carried a walking stick, and held a long cigarette holder clenched between his teeth at a jaunty angle."