John Behr is the Fr George's Florovsky Distinguished Professor of Patristics at St Vladimir's Seminary, where he served as Dean from 2007-17, and the Metropolitan Kallistos Chair of Orthodox Theology at the Vrije Universiteit of Amsterdam. His publications include critical editions and translations of the fragments of Diodore of Tarsus and Theodore of Mopuestia (2011) and Origen's On First Principles (2017). He is the author of Irenaeus of Lyons: Identifying Christianity (2013), Becoming Human: Theological Anthropology in Word and Image (2013), and Asceticism and Anthropology in Irenaeus and Clement (2000).