Jack Copeland is Professor of Philosophy at the University of Canterbury, New Zealand, where he is Director of the Turing Archive for the History of Computing. His books include The Essential Turing, Colossus: The Secrets of Bletchley Park's Codebreaking Computers, Alan Turing's Automatic Computing Engine, Logic and Reality: Essays on the Legacy of Arthur Prior (all with Oxford University Press), and he has published more than 100 articles on the philosophy and history of computing, and mathematical and philosophical logic.