C.G. Jung and Adolf Keller, On Theology and Psychology: A Correspondence, Philemon Series, Marianne Jehle-Wildberger (ed.), Heather McCartney with John Peck (trans.), (Princeton, NJ:  Princeton University Press, 2020,  305 pp.)

This volume chronicles the relationship between C.G. Jung (1875-1961) and Adolf Keller (1872-1963), a Protestant churchman and leader of the ecumenical movement in Europe and the United States. It consists of three sections: ‘Part I. From Beginnings to 1943’, which describes their personal and professional relationship; ‘Part II. The Correspondence Between Jung and Keller’, which includes an introduction that charts their relationship after 1943 and their letters from 1915 to 1958; and ‘Appendix. Adolf Keller: Analytical Psychology and Religious Research’, which is a substantial essay by Keller originally published in a Festschrift for Jung's sixtieth birthday in 1935. The book is part of the steady stream of newly translated material by Jung and his collaborators published by the Philemon Foundation. The Foundation's mission is to bring to print Jung's as yet unpublished manuscripts, seminars and correspondence, which number in the tens of thousands of pages.

Adolf Keller and Tina Keller-Jenny, his wife, were participants in and witnesses to the emergence of analytical psychology as a distinct community and practice. They attended groups in which Jung was formulating his ideas. In January 1913, Jung organized the Psychoanalytic Society as a continuation of the Zurich Regional Group of the International Psychoanalytic Association (IPA). ‘Keller played a prominent role in the society and belonged among the regular attendees. His frequent questioning was impressive […] Keller proved indispensable in this process by constantly pushing Jung to be more precise about his views, and minutes show that he was often the only member of the society to do this’ (pp. 24-6). Oskar Pfister, a clergyman and psychoanalyst, and Ludwig Binswanger, a psychiatrist, who were active in the Zurich psychoanalytic scene, were still participating at this stage. Subsequently when the split with Freud became formalized Pfister sided with Freud and Keller chose Jung. Binswanger moved on to establi