Correspondence Simon's correspondence provides a full account of his dealings with many other fellow scientists and scientific organisations. It gives a detailed commentary on Simon's research work from the 1920s onwards and also illustrates Simon's thinking on contemporary issues. A major theme of Simon's post-1945 correspondence is the impact of the Second World War on the lives and careers of scientists in both the United Kingdom and Germany. Simon had strong feelings regarding German scientists who he viewed as collaborators with the Nazi Party and the strength of his emotions comes across in his post-war correspondence. The correspondence has been arranged into the following 5 sections (for more details see the 'Arrangement' field): Pre-1939 correspondence Post-1939 correspondence Personal correspondence Correspondence with Institutions, Groups and Organisations Correspondence on 'Ideas' 1922-1956