He has been a Fulbright Senior Research Scholar and Visiting Fellow at Cambridge University and has lectured widely throughout the world. An expert on the psychology of forgiveness and reconciliation among the world’s religions, he is the author of The Seven Deadly Sins: Jewish, Christian, and Classical Reflections on Human Psychology and Wounds Not Healed by Time: The Power of Repentance and Forgiveness, both published by Oxford University Press. His forthcoming book, also to be published by Oxford University Press, is tentatively titled The Tenacity of Unreasonable Beliefs: Jewish Christian and Muslim Scriptural Fundamentalists.