The essay deals with Erich Schneider (1900–1970) who played a decisive role in the establishment of Keynesianism in economic theory in Germany after World War II. It was not without a certain irony that an admiring disciple of Schumpeter was primarily responsible for the implementation of Keynesian economics. Major transmission mechanisms were his textbooks which dominated in the 1950s and 1960s and his function as chairman of the Theoretical Committee of the Verein für Socialpolitik. Schneider, originally a high school teacher in mathematics, was deeply influenced by Schumpeter with whom he habilitated at the University of Bonn. Schneider became professor in Aarhus, Denmark, for almost a decade, before from 1946 onwards at Kiel he was at the zenith of his academic influence and (inter-) national recognition.