Sigmund Freud was the founder of psychoanalysis, simultaneously a theory of personality, a therapy, and an intellectual movement. He was born into a middle-class Jewish family in Freiburg, Moravia, now part of Czechoslovakia, but then a city in the Austro-Hungarian Empire. At the age of 4, he moved to Vienna, where he spent nearly his entire life. In 1873 he entered the medical school at the University of Vienna and spent the following eight years pursuing a wide range of studies, including philosophy, in addition to the medical curriculum. After graduating, he worked in several clinics and went to Paris to study under Jean-Martin Charcot, a neurologist who used hypnosis to treat the symptoms of hysteria. When Freud returned to Vienna and set up practice as a clinical neurologist, he found orthodox therapies for nervous disorders ineffective for most of his patients, so he began to use a modified version of the hypnosis he had learned under Charcot. Gradually, however, he discovered that it was not necessary to put patients into a deep trance; rather, he would merely encourage them to talk freely, saying whatever came to mind without self-censorship, in order to bring unconscious material to the surface, where it could be analyzed. He found that this method of free association very often evoked memories of traumatic events in childhood, usually having to do with sex. This discovery led him, at first, to assume that most of his patients had actually been seduced as children by adult relatives and that this was the cause of their neuroses; later, however, he changed his mind and concluded that his patients' memories of childhood seduction were fantasies born of their childhood sexual desires for adults. (This reversal is a matter of some controversy today.) Out of this clinical material he constructed a theory of psychosexual development through oral, anal, phallic and genital stages.