H. Keith Melton is an internationally recognized intelligence historian and authority on espionage technology. He is the author of Ultimate Spy: Inside the Secret World of Espionage and coauthor of Spycraft: The Secret History of the CIA's Spytechs, from Communism to al-Qaeda with Robert Wallace.

Robert Wallace is the former director of the Central Intelligence Agency's Office of Technical Service, founder of the Artemus Consulting Group, and contributor to the CIA's Center for the Study of Intelligence. He has written five books with H. Keith Melton, including Spy Sites of Washington, DC.

Henry R. Schlesinger is a New York-based writer who has collaborated with the authors on several books, including Spy Sites of Washington, DC and Spycraft.