Bruce Mazlish was one of the first historians to establish himself as a practitioner of what has relatively recently become known as psychohistory. The “modern era” of psychohistory began in 1957 with an address to the American Historical Association by its president, William Langer (1958). In that presidential address, Langer predicted that the future of history rested with those who would study the role of the psyche in shaping human destiny. Mazlish was one of those convinced by this prediction. Langer, a distinguished historian of European diplomacy, was influenced in his views by his brother, Walter, a psychoanalyst who during World War II produced a psychoanalytic profile of Adolf Hitler (Langer, 1972) for the Office of Special Services, the forerunner of the CIA. William Langer's prediction thus rested on the conviction that the application of psychology to history would take the