The concise curriculum vitae of the founder of existential analysis is followed by an introduction to the five stages of the development of that psychotherapy: the stage of learning, of practice, of criticism, of the alternative to psychoanalysis and of reconciliation. The criticism aimed especially at Freud's naturalism and at the concept of drive. These concepts were opposed by ontoanalytic doctrines derived from the Heidegger's ontoanalysis. The differences between both psychotherapies were exemplified by a presentation of the treatment of a "hysterical phobia" which was originally explained in psychoanalytic and later in ontoanalytic terminology.