Mircea Eliade (1907–1986) was the Sewell L. Avery Distinguished Service Professor of the History of Religions at the University of Chicago. His many books include Shamanism: Archaic Techniques of Ecstasy, Images and Symbols: Studies in Religious Symbolism, and Yoga: Immortality and Freedom (all Princeton). Jonathan Z. Smith (1938–2017) was the Robert O. Anderson Distinguished Service Professor of the Humanities at the University of Chicago. He was the author of Imagining Religion: From Babylon to Jonestown and Relating Religion: Essays in the Study of Religion.

"Luminous, profound and extremely stimulating. . . . This is an essay which everyone interested in the history of religion and in the mentality of ancient man will have to read. It is difficult to speak too highly of it."—Review of Religion