Philip G. Ziegler is Professor of Christian Dogmatics at the University of Aberdeen. He is the author of Doing Theology When God is Forgotten: The Theological Achievement of Wolf Krötke (2007) and Militant Grace: The Apocalyptic Turn and the Future of Christian Theology (2018). He is a General Secretary of the Karl Barth Society of North America, and had served on the executive committee of the English language section of the International Bonhoeffer Society. Michael Mawson is Senior Lecturer in Theology at Charles Sturt University, and was previously Senior Lecturer in Theological Ethics at the University of Aberdeen. He is the author of Christ Existing as Community: Bonhoeffer's Ecclesiology (2018) and co-editor of Christ, Church and World: New Studies in Bonhoeffer's Theology and Ethics (with Philip G. Ziegler; 2016).