Psychologist Carl Gustav Jung (1875–1961), who was born in the village of Kessweil, Switzerland on July 26, and died on June 6 in Zurich was, along with Sigmund Freud (1856–1939), a creator of depth psychology. His controversial research in this area has ethical implications for both makers and users of modern technology. Jung received an undergraduate degree in psychiatry at the University of Basel and completed his doctoral studies at Burghölzli mental hospital in 1902. In 1907 he achieved international recognition with his seminal study of dementia praecox (schizophrenia), leading to a five-year collaboration with Freud, the originator of psychoanalysis. By 1912, however, Jung found his ideas diverging from those of Freud, and from that point until the end of his life, Jung's intellectual journey was both creative and independent.

Like his former mentor, Jung was determined to penetrate and comprehend the human psyche at the deepest possible level. Unlike...