Rabbi Reuven Firestone, PhD, is professor of Medieval Jewish and Islamic Studies at Hebrew Union College Jewish Institute of Religion. He is the author of Introduction to Islam for Jews and Children of Abraham: An Introduction to Judaism for Muslims, among other books. He is a frequent speaker on the topics of early Islam and its relationship to Judaism and Christianity, scriptural interpretation of the Bible and Qur'an, and the phenomenon of holy war in the Abrahamic religions.