Andrei A. Orlov is Professor of Judaism and Christianity in Antiquity at Marquette University, Milwaukee, USA. He is a specialist in Jewish and Christian apocalypticism and mysticism, Second Temple Judaism, and Old Testament pseudepigrapha. Within the field of early Jewish literature, Orlov is considered among the leading experts in the Jewish pseudepigrapha preserved in Slavonic language, including 2 Enoch and the Apocalypse of Abraham. He is the author of more than twenty books, including The Enoch-Metatron Tradition and The Glory of the Invisible God: Two Powers in Heaven Traditions and Early Christology.