Jung, Carl Gustav (1875โ€“1961), a Swiss psychologist and psychiatrist. He founded analytical psychology after his association (1906โ€“13) with Sigmund Freud in the development of psychoanalysis. Jung's theory of human behavior differed from Freud's mainly in the lesser importance Jung gave to the sex drive. Jung emphasized the supremacy of the will to live. He developed the concept of the collective unconscious, the idea that the collective experience of humankind is recorded in an individual's unconscious mind (the part of the mind whose content is not brought to awareness easily or voluntarily).

Jung was born in Switzerland, and received a medical degree from the University of Basel in 1900. He taught psychiatry at the universities of Zurich and Basel. In 1948 he founded the C. G. Jung Institute, Zurich, to train psychoanalysts.

Jung's books include: Analytical Psychology (1916); Studies in Word Association (1918); Psychological Types (1923); Psychology and Religion (1938); Memories, Dreams, Reflections (1962), an autobiography. C. G. Jung: Letters, in two volumes (1973, 1976), was edited by Gerhard Adler.