Ashraf `Ali Thanawi (1863-1943) was one of the most prominent religious scholars in Islamic history. Author of over a thousand books on different aspects of Islam, his work sought to defend the Islamic scholarly tradition and to articulate its authority in an age of momentous religious and political change. In this authoritative biography, Muhammad Qasim Zaman offers a comprehensive and highly accessible account of Thanawi's multifaceted career and thought, whilst also providing a valuable introduction to Islam in modern South Asia.