Johannes Zachhuber holds a doctorate from the University of Oxford and a Habilitation from Humboldt University, Berlin. After completing his DPhil in 1998, he taught at Humboldt University in Berlin until 2005 when he joined the University of Oxford and was appointed Fellow of Theology at Trinity College, Oxford. In 2014, he was named Professor of Historical and Systematic Theology at the University of Oxford. His research ranges across the history of Christian theology with a special emphasis on late antiquity and the nineteenth century.Andrew Radde-Gallwitz is Professor at the University of Notre Dame. He works on the intellectual history of Christianity from the second through the fifth centuries. With particular interest in early Christian doctrine, his research focuses on late ancient Platonism and the tradition of negative theology. He is the author of Basil of Caesarea, Gregory of Nyssa, and the Transformation of Divine Simplicity (2009), Basil of Caesarea (2012), and Gregory of Nyssa's Doctrinal Works (2018).