Barbara Hannah was a lecturer and training analyst at the C.G. Jung Institute in Zurich, where she had been active for many years. In addition to numerous articles in professional journals, she was the author of several books.

Marie-Louise von Franz (1915–1998) lived in Kusnacht, Switzerland and was a scholar of Medieval Latin as well as a major figure in analytical psychology. She met Jung in 1933 and worked with him from 1934 until his death in 1961. A founder of the C.G. Jung Institute in Zurich, she has published widely on subjects including dreams, alchemy, personality typology, and fairy tales.

Aion, a major work from Jung's later years, has long been a source of fascination for a wide variety of scholars and thinkers. Presented here are two substantial commentaries on this rich and complex text by two important figures in Jung's life and work: Barbara Hannah and Marie-Louise von Franz.

Hannah delivered these lectures in 1957 at the C.G. Jung Institute in Zürich. She addresses each chapter of Aion, providing detailed, in-depth analysis of selected passages, while suggesting resources for further study. Well-paced and thoughtfully planned, she scans the work from beginning to end, illuminating many subtle nuances.

In a private interview with Claude Drey in her home during the spring of 1965, Marie-Louise von Franz looks closely at chapter fourteen of Aion-"The Structure and Dynamics of the Self." Published here for the first time, von Franz offers a lively and free-flowing discussion of key passages in Jung's work.

This is the first volume in a new series edited by Emmanuel Kennedy-Xypolitas, "Polarities in the Psyche," focusing on the broad theme of the opposites in the psyche. The second volume will be The Archetypal Symbolism of Animals (also from Chiron Publications)