the father of psychoanalysis, was an Austrian physiologist, medical doctor, psychologist and influential thinker of the early twentieth century. Because Freud did not use the scientific method to formulate his controversial theories, many of them have been discredited, including his theories about "hysterical" women. In fact, "the controversy which exists in relation to Freud is more heated and multi-faceted than that relating to virtually any other post-1850 thinker (a possible exception being Darwin)". However, Freud's focus on the unconscious mind distinguishes him from all other clinicians and philosophers that came before him, and his work laid the foundation for modern psychoanalytic therapy.