Gregory J. Riley is Professor of New Testament and Early Christianity at Claremont Graduate University, Claremont, CA. He earned a B.A. and an M.A. at the University of California, Los Angeles; an M.A. at the University of California, Santa Barbara; and an M.A. and a Ph.D. at Harvard. Dr. Riley's expertise lies in the culture and religions of the Greco-Roman world and the ancient Near East. His main interests are the relationships between the diverse expressions of Christianity and their cultural context. His book The River of God: A New History of Christian Origins was chosen by the History Book Club as an alternate selection. His book One Jesus, Many Christs was selected by the Book of the Month Club and the British Book of the Month Club as a first choice in Religion.