Professor of Theology, Wheaton College

Lecturer, Mater Ecclesiae College, St Mary's University Twickenham, London

Research Fellow, Australian Catholic University

University of St. Thomas

Emeritus Professor, University of Pretoria

Sekolah Tinggi Teologi Kharisma Bandung

Professor of Philosophy, Religious Studies, and Theology

Professor of Patristics and Historical Theology, McMaster Divinity College

Truett Theological Seminary -- Baylor University

Provost and Professor of Historical Theology, Midwestern Baptist Theological Seminary