John Haldon is Professor of History and Hellenic Studies at Princeton University and is currently a Senior Research Fellow at the Dumbarton Oaks Center for Byzantine Studies. His previous publications include Byzantium in the Seventh Century: The Transformation of a Culture (1990; revised edition 1997) and Byzantium: A History (2000). He has edited The Social History of Byzantium: Problems and Perspectives (2008) and co-edited, with Elizabeth Jeffreys and Robin Cormack, The Oxford Handbook of Byzantine Studies (2008).