John Arquilla is a true visionary in national security and technology. Together with David Ronfeldt, he developed the concept of "cyberwar" in the early 1990s and was one of the first analysts to appreciate how digital and related technologies were transforming armed conflict. Now Distinguished Professor Emeritus at the United States Naval Postgraduate School, Arquilla is the author, most recently, of Bitskrieg: The New Challenge of Cyberwarfare.