John Haldon is Professor of Byzantine History at Princeton University. His research focuses on the history of the early and middle Byzantine period, on medieval state structures across the European and Islamic worlds, on the appropriation and distribution of resources in pre-industrial societies, and on logistical systems. He has published many books and articles, including Byzantium in the Iconoclast Era (ca 680-850): The Sources (Ashgate 2001) and State, Army and Society in Byzantium: Approaches to Military, Social and Administrative History, 6th-12th Centuries (Ashgate).