Andrei A. Orlov is Professor of Judaism and Christianity in Antiquity at Marquette University, USA. He has written extensively on Jewish apocalypticism and early Jewish mysticism, including The Enoch-Metatron Tradition (Mohr Siebeck, 2005), Heavenly Priesthood in the Apocalypse of Abraham (Cambridge University Press, 2013), and Glory of the Invisible God: Two Powers in Heaven Traditions and Early Christology (Bloomsbury, 2019).