Sigmund Freud

Sigmund Freud (born Sigismund Schlomo Freud; 6 May 1856 – 23 September 1939) was an Austrian neurologist and the founder of psychoanalysis, a clinical method for treating psychopathology through dialogue between a patient and a psychoanalyst. Psychoanalysis includes the theories of id, ego and super-ego, Oedipus complex, repression, and defense mechanism. - from Wikipedia