The Bletchley Park Codebreakers in Their Own Words

Joel Greenberg is an author and historian who researches and writes about signals intelligence and its impact on two world wars. He is the author of _Gordon Welchman, Bletchley Park's Architect of Ultra Intelligence_. His book is the basis of a joint BBC/Smithsonian Network 2015 documentary about Welchman - _The Forgotten Genius of Bletchley Park_.