 His own belief in the central importance of the reality of the unconscious never faltered, however, even with the fading of his dream of a synthesis that "would do justice to the rigorous demands of experimental psychology and to the psychic realities experienced by the explorers of the unconscious".From 1956 to 1959, Ellenberger started teaching the history of psychiatry at the Menninger Foundation (where George Devereux already gave a lecture on psychoanalysis and anthropology).The experience of exile played a key role in explaining the Ellenberger's interest in history.