The Netherne Hospital in Surrey is perhaps the most prestigious site in the history of British art therapy, associated with the key figures Edward Adamson and Eric Cunningham Dax, whose pioneering work involved the setting-up of a large studio for psychiatric patients to create expressive paintings. What is little-known, however, is the work of the designated scientist for psychiatric research, Hungarian Jewish emigre Francis Reitman, who was charged with an overall scientific analysis of the artistic products of the studio. Schooled in the biological psychiatric tradition of Ladislas J. Meduna in Budapest prior to his exile to the Maudsley Hospital in 1938 - and committed to treatments such as leucotomy and electro-convulsive therapy (ECT) - Reitman was an unusual candidate for research into the unconscious processes behind art and psychosis. Yet he authored two highly popular and widely reviewed books on his analyses of the abundant artistic output created by patients with schizophrenic diagnoses at the Netherne. In his Psychotic Art (1950) and Insanity, Art and Culture (1954), Reitman compared such schizophrenic images with those produced by artists under the influence of mescaline and examined the artistic output of patients having undergone leucotomy. This article draws on archival materials and Reitman's original research publications in order to reconstruct his theory of schizophrenic art within the complex context of postwar British psychiatry, negotiating as he did between biologically reductive understandings of Freudian and Jungian psychoanalytic categories, and ultimately synthesizing concepts from both. It also analyses Reitman's implicit theory of the therapeutic mechanism of art in the treatment of psychiatric patients.