The Muslim thinker al-Ghazali (d. 1111) was one of the most influential theologians and philosophers of Islam and has been considered an authority in both Western and Islamic philosophical traditions. Born in northeastern Iran, he held the most prestigious academic post in Islamic theology in Baghdad, only to renounce the position and teach at small schools in the provinces for no money. His contributions to Islamic scholarship range from responding to the challenges of Aristotelian philosophy to creating a new type of Islamic mysticism and integrating both these traditions-falsafa and...