Wilhelm Reich (24 March 1897 – 3 November 1957) was an Austrian psychoanalyst, a member of the second generation of psychoanalysts after Sigmund Freud, and one of the most radical figures in the history of psychiatry. He was the author of several influential books and essays, most notably Character Analysis (1933), The Mass Psychology of Fascism (1933), and The Sexual Revolution (1936). His work on character contributed to the development of Anna Freud’s The Ego and the Mechanisms of Defence (1936), and his idea of muscular armour – the expression of the personality in the way the body moves – shaped innovations such as body psychotherapy, Fritz Perls’s Gestalt Therapy, and Alexander Lowen’s bioenergetic analysis. His writing influenced generations of intellectuals.