Carl Gustav Jung (July 26th 1875 - June 6th 1961) the Swiss psychiatrist. He was a disciple of Freuds for five years until he broke away in 1912. While he found Freud's explanations in terms of infantile sexuality acceptable for neuroses such as hysteria, he rejected the view that they could fully explain more serious disorders such as schizophrenia. His influence has been less than Freud's although he did popularise such concepts as introvert" and "extrovert" and he also formulated the idea of a "collective unconcious" as a consequence of following his interest in primitive myths."