The teachings of Aḥmad al-Ghazālī changed the course of Persian Sufism forever, paving the way for luminaries such as Rūmī, Aṭṭār, and Ḥāfiẓ. Yet he remains a poorly understood thinker, with many treatises incorrectly attributed to him and conflicting accounts in the historiographical literature. This work provides the first examination of Aḥmad al-Ghazālī and his work in Western scholarly literature. Joseph E. B. Lumbard seeks to ascertain the authenticity of works attributed to this author, trace the development of...