Peter J. Denning is Distinguished Professor Emeritus of Computer Science at the Naval Postgraduate School, Monterey, California. He invented the working-set model, the foundation for managing virtual memory in computer operating systems. He is a past president of the Association for Computing Machinery. He co-founded CSNET, a key bridge between the early ARPANET and today's Internet. He relishes the enduring principles underlying computing, AI, and innovation. His books include The Innovator's Way (w Bob Dunham), Navigating a Restless Sea (w Todd Lyons), and Great Principles of Computing (w Craig Martell). His latest, Turing's Mistake, challenges a founding assumption of AI and argues that human understanding is not machine computable.