David Kahn is a historian who writes on military codebreaking. He earned a D.Phil in modern German history from Oxford University in 1974 under the supervision of the then-Regius professor of modern history, Hugh Trevor-Roper. Librarian Note: There is more than one author in the GoodReads database with this name. See this thread for more information.
Series
Books

The Reader Of Gentlemen's Mail
2004

Krav Maga Defense
How to Defend Yourself Against the 12 Most Common Unarmed Street Attacks
2016

Advanced Krav Maga
The Next Level of Fitness and Self-Defense
2007

Cape, Spandex, Briefcase
Leadership Lessons from Superheroes
2015

Hitler's Spies
German Military Intelligence in World War II
1978

Kahn on Codes
1984

Seizing The Enigma
1991

Krav Maga Professional Tactics
The Contact Combat System of the Israeli Martial Arts
2016

Krav Maga Weapon Defenses
The Contact Combat System of the Israel Defense Forces
2012

What If? 2
Eminent Historians Imagine What Might Have Been
2000

The Codebreakers
The Comprehensive History of Secret Communication from Ancient Times to the Internet
1967

Krav Maga
An Essential Guide to the Renowned Method--for Fitness and Self-Defense
2004