In the world of psychoanalysis, the late Otto Fenichel was pre-eminently distinguished for brilliant scholarship, incisive powers of observation, tireless energy and skill. "There was nothing in the analytic atmosphere," says Bertram D. Lewin in his Introduction, "for which he did not serve as a condenser, no currents for which he did not serve as a medium. His justly famous book The Psychoanalytic Theory of Neurosis, with its immense erudition and textual profusion, is monumental and a lasting demonstration of his immense capacity.".