John Anthony McGuckin is Anne Marie and Bent Emil Nielsen Professor in Late Antique and Byzantine Christian History at Union Theological Seminary in New York City and Professor of Byzantine Christian Studies at Columbia University. A Priest of the Orthodox Church, he was formerly Reader in Patristic and Byzantine Theology at the University of Leeds, England. He is the author of numerous books of historical theology and was elected a Fellow of the Royal Historical Society of Great Britain.

John Anthony McGuckin is Anne Marie and Bent Emil Nielsen Professor in Late Antique and Byzantine Christian History at Union Theological Seminary in New York City and Professor of Byzantine Christian Studies at Columbia University. A Priest of the Orthodox Church, he was formerly Reader in Patristic and Byzantine Theology at the University of Leeds, England. He is the author of numerous books of historical theology and was elected a Fellow of the Royal Historical Society of Great Britain.

John Anthony McGuckin is Anne Marie and Bent Emil Nielsen Professor in Late Antique and Byzantine Christian History at Union Theological Seminary in New York City and Professor of Byzantine Christian Studies at Columbia University. A Priest of the Orthodox Church, he was formerly Reader in Patristic and Byzantine Theology at the University of Leeds, England. He is the author of numerous books of historical theology and was elected a Fellow of the Royal Historical Society of Great Britain.