He developed the ideas of the id, ego, and superego in Beyond the Pleasure Principle.
This man introduced cocaine to Karl Koller as a cure for morphine addiction, and he first gained recognition for discovering the reproductive organs in eels. He wrote numerous letters to Wilhelm Fliess, and analyzed the Jewish religion in another work, Moses and Monotheism. He argued that structured society infringes upon individual desires in his Civilization and Its Discontents, and wrote a case study on Anna O., Studies on Hysteria.  He developed the ideas of the id, ego, and superego in Beyond the Pleasure Principle. For 10 points, name this Austrian psychoanalyst, the author of The Interpretation of Dreams.
This man introduced cocaine to Karl Koller as a cure for morphine addiction, and he first gained recognition for discovering the reproductive organs in eels.
Sigmund {Freud} or Sigismund Schlomo {Freud}