Diarmaid MacCulloch is a professor of the History of the Church at Oxford University. His books include Thomas Cromwell: A Revolutionary Life; Thomas Cranmer: A Life, which won the Whitbread Biography Prize, the James Tait Black Prize, and the Duff Cooper Prize; The Reformation: A History, winner of the National Book Critics Circle Award and the Wolfson Prize; and Christianity: The First Three Thousand Years, a New York Times bestseller that won the Cundill Prize in History. A former Anglican deacon, he has presented many highly celebrated documentaries for television and radio. He lives in Oxford, England.