Robert Wallace is the former director of the Central Intelligence Agency’s Office of Technical Service. He and H. Keith Melton have co-authored four books, including Spycraft: The Secret History of the CIA’s Spytechs, from Communism to Al-Qaeda, The Official CIA Manual of Trickery and Deception, Spy Sites of New York City, and Spy Sites of Philadelphia.

H. Keith Melton is an intelligence historian and author of several books,including Ultimate Spy: Inside the Secret World of Espionage. He owns one ofthe largest collections of spy paraphernalia in the world.

Henry R. Schlesinger is a New York-based writer who has collaborated previously with the authors on Spyycraft, Spy Sites of Philadelphia and Spy Sites of New York City.