Steven M. Bellovin is the Percy K. and Vidal L. W. Hudson Professor of computer science at Columbia University, where he does research on networks and security--especially why the two don't get along--as well as related public policy issues. He joined the faculty in 2005 after many years at Bell Labs and AT&T Labs Research, where he was an AT&T Fellow. Bellovin has served as Chief Technologist of the Federal Trade Commission and he is a member of the National Academy of Engineering and is serving on the Computer Science and Telecommunications Board of the National Academies of Sciences, Engineering, and Medicine. In the past, he has been a member of the Department of Homeland Security's Science and Technology Advisory Committee, and the Technical Guidelines Development Committee of the Election Assistance Commission; he has also received the 2007 NIST/NSA National Computer Systems Security Awardand has been elected to the Cybersecurity Hall of Fame. Bellovin is the co-author of Firewalls and Internet Security: Repelling the Wily Hacker, Second Edition (Addison-Wesley, 2003), and holds a number of patents on cryptographic and network protocols.