Wilhelm Reich 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, most notably Character Analysis and The Mass Psychology of Fascism . His work on character contributed to the development of Anna Freud's The Ego and the Mechanisms of Defence, 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, Alexander Lowen's bioenergetic analysis, and Arthur Janov's primal therapy. His writing influenced generations of intellectuals: during the 1968 student uprisings in Paris and Berlin, students scrawled his name on walls and threw copies of The Mass Psychology of Fascism at the police.
After graduating in medicine from the University of Vienna in 1922, Reich studied neuropsychiatry under Julius Wagner-Jauregg and became deputy director of the Vienna Ambulatorium, Freud's psychoanalytic outpatient clinic.