Frank Griffel is Professor of Islamic Studies at Yale University. He has published widely in the fields of Islamic philosophy and theology as well as Muslim intellectual history. After working on apostasy in Islam and on the leading theologian and philosopher al-Ghazali (d. 1111), Griffel turned his interest toward the history of philosophy in Islam, particularly during the 12th century. It turns out to be crucial for our understanding of the later periods of Islamic intellectual history. This talk will be about his most recent book, The Formation of the Post-Classical Period in Islam, which came out in 2021.