The work of Herbert A. Simon has drawn increasing attention from modern scholars who argue that Simon's work changed during the Cold War. This is due to the fact that Simon seemingly changed the substance of his research in the 1950s. This paper argues that Simon did not change in any significant way, but was lead by his interest in decision making and rationality into areas of economics, political science, sociology, psychology, organization theory, and computer science. He used elements of different disciplines to address his overall interest and there is therefore a considerable continuity in Simon's work. This paper also provides part of a background for the recent increase of interest in Simon's ideas by providing some details of the RAND Corporation and the Ford Foundation's support of scientific research through the post war years in general, and their connections to the behavioral science research at Carnegie Mellon University in particular.