J. Gary Sparks is a 1982 graduate of the C. G. Jung Institute in Zürich. He is the author of At the Heart of Matter: Synchronicity and Jung’s Spiritual Testament (2007), Valley of Diamonds: Adventures in Number and Time with Marie-Louise von Franz (2009), Carl Jung and Arnold Toynbee: The Social Meaning of Inner Work (2017), The Call of Destiny: An Introduction to C.G. Jung’s Major Works (2023). He is also editor of Edward F. Edinger’s Ego and Self: The Old Testament Prophets (2000) and co-editor with Daryl Sharp of Edinger’s Science of the Soul: A Jungian Perspective (2002). He lives and practices in Indianapolis, USA.