Mark Riebling writes about national security. He is the author of Wedge: The Secret War between the FBI and CIA (Simon & Schuster). He co-founded the Center for Tactical Counterterrorism, and served as research director for the Center for Policing Terrorism/National Countererrorism Academy. He studied at Dartmouth, Berkeley, and Columbia. His writing has appeared in The Wall Street Journal and The New York Times.