The field of study known as psychobiography has taught us that theories do not arise solely from rational deduction. Factors such as life events, historical context, and encounters with the unconscious may all play a part. In this presentation, Dr. Moretti addresses two major encounters with the unconscious that deeply affected Jung’s theory: The first of these is the period from 1912-1918, when the material that became the Red Book was written. By his own description, everything he later wrote had its beginnings in this encounter. The second encounter with the unconscious occurred during Jung’s 1944 hospitalization and near-death experience, which influenced Jung’s expansion of the concept of the Self. Encounters in the outer world with Otto Gross, Sigmund Freud, and William James are also briefly touched upon.