Bruce J. MacLennan, PhD, is a professor at the University of Tennessee. For more than forty years, he has been a student of ancient Greek and Roman philosophy and religion. He has published journal articles and book chapters on Neoplatonic spiritual practices, Jungian psychology, and neurotheology. MacLennan is invited regularly to give international presentations and offers regular workshops on Neoplatonic spiritual practice, Pythagoreanism, theurgy, and related subjects. He lives in Knoxville, Tennessee.