David Kahn holds a PhD in history from Oxford University. He worked for thirty years as a journalist in New York and Paris, and taught intelligence courses at Yale and Columbia. In 2002, he was scholar-in-residence at the National Security Agency in Washington, D.C. His massive history of cryptology, The Codebreakers, is still considered the standard work on the subject.
Books by David Kahn
Seizing the Enigma
Softcover