No-one seriously doubts the importance of E. H. Carr in the history of the study of international relations. The publication of The Twenty Years' “Crisis, 1919–1939, in 1939 marked a turning point in international theory, ending, as it did in Britain, the dominance of the more traditional ‘pro-gressivist’ or ‘idealist’ schools of thought characterized in the writings of, for example, Norman Angell, Bertrand Russell, Alfred Zimmern, Arnold Toynbee, G. Lowes Dickinson and others. The bulk of Carr's work in the field was written in the twenty or so years between 1936 (when he accepted the Woodrow Wilson Chair of International Politics at Aberystwyth) and 1955 (when he accepted a Fellowship at Trinity, his old Cambridge College), and since then his energies have been concentrated on his abiding concern with the history of Soviet Russia. Nevertheless, he is still an important figure in the field and although international relations has not been his life' work, his unique contribution to its understanding, ensures him a permanent place in the British tradition of international studies.