Sigmund Freud was born on 6 May 1856 in Freiberg, Moravia (now Příbor in the Czech Republic), the eldest son of a Jewish wool merchant. The family moved to Vienna when Freud was four, and it was in Vienna — the most intellectually fertile city in Europe at the turn of the century — that he would spend virtually his entire life and develop the ideas that would transform Western culture.
Freud trained as a neurologist and spent his early career doing serious scientific research — on the nervous systems of eels, on the properties of cocaine (which he briefly and disastrously championed as a wonder drug), and on the neurological basis of aphasia. His turn toward the psychological came through his collaboration with Josef Breuer, whose patient "Anna O." appeared to recover from hysterical symptoms through talking — the birth of what would become the talking cure. Freud studied with the neurologist Jean-Martin Charcot in Paris, where he witnessed hypnosis used to induce and remove hysterical symptoms, and returned to Vienna convinced that psychological disturbances had psychological — not merely neurological — causes.
His Interpretation of Dreams, published in 1900 (though dated 1899 — Freud wanted it to inaugurate the new century), established the framework that would occupy him for the rest of his life: the unconscious, repression, wish fulfilment, the Oedipus complex. He built a school of followers, fought bitterly with those who departed from his views (most famously Alfred Adler and Carl Jung), and developed psychoanalysis into an international movement.
When the Nazis annexed Austria in 1938, Freud — Jewish and internationally famous — was in danger. His books had been burned in Germany in 1933. He fled to London in 1938, dying there of jaw cancer (he had smoked cigars compulsively for decades despite the cancer) on 23 September 1939, just weeks after the Second World War began. He was 83.