Ronald H. Stone taught for years at Pittsburgh Theological Seminary and the University of Pittsburgh. After retiring, he continues to teach in Carnegie Mellon University's Osher Life Long Learning Program. He studied at Union Seminary and Columbia University in New York City, where he served as Reinhold Niebuhr's last teaching assistant and met Paul Tillich. He has published more than twenty books on religion, politics, and philosophy, and served as the president of the North American Paul Tillich Society and founding board member of the Niebuhr Society.