Carl Gustav Jung was one of the great pioneers of modern psychiatry. He was born in 1865 in Switzerland, where he studied medicine and psychiatry and later became one of Sigmund Freud's early supporters and collaborators. Eventually, serious theoretical disagreements (among them Jung's view of the religious instinct in man) led to a doctrinal and personal break between the two famed psychiatrists. Dr. Jung was the author of many books, and he lived and practiced for many years in his native Zurich. He died in 1961.