In his most important contribution to the Heidelberg school, a founder of existentialism critiques the scientific aspirations of psychotherapy. In 1910, Karl Jaspers wrote a seminal essay on morbid jealousy in which he laid the foundation for the psychopathological phenomenology that through his work and the work of Hans Gruhle and Kurt Schneider, among others, would become the hallmark of the Heidelberg school of psychiatry. In...