Léon Chertok (born October 27, 1909, in Russia) was a distinguished psychiatrist and neuroscientist known for his significant contributions to the understanding of psychotherapy and the history of mental health practices. Throughout his career, he explored the evolution of therapeutic techniques from Mesmerism to Freud, blending historical insight with clinical expertise. Chertok's work has influenced both practitioners and scholars interested in the development of psychological treatment methods.