Bruce J. MacLennan, PhD (Knoxville, TN) has been a student of ancient Greek and Roman philosophy and religion for more than forty years, and for the past twenty-five he has studied the relationship between Neoplatonic spiritual practices, Jungian psychology, and neurotheology. He has published journal articles and book chapters on these topics, and has presented his work at meetings of the International Society for Neoplatonic Studies and the Society for the Scientific Study of Religion. MacLennan offers regular workshops on Neoplatonic spiritual practice, Pythagoreanism, theurgy, and related subjects. In his professional capacity as a professor of computer science, MacLennan researches artificial intelligence, autonomous robotics, artificial life, artificial morphogenesis, self-organizing systems, and the mind-body connection, including the relation of the brain to consciousness and the collective unconscious. He has published several books and more than sixty scholarly articles, and he is invited regularly to give international presentations on his work.