Peter Heather is Chair of Medieval History at King’s College, London. His books include The Fall of the Roman Empire, Empires and Barbarians, The Restoration of Rome, Rome Resurgent, and Christendom: The Triumph of a Religion, AD 300–1300. He lives in London, UK. John Rapley is a political economist at the University of Cambridge and a Senior Fellow at the Johannesburg Institute for Advanced Study. His books include Understanding Development, Globalization and Inequality, and Twilight of the Money Gods: Economics as a Religion and How It all Went Wrong. He lives in London, UK, and Ottawa, Canada.