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. He is also the author of Alastair Denniston, Code-breaking from Room 40 to Berkeley Street and the Birth of GCHQ. The book is both a biography of Denniston and an account of signals intelligence from its early development to the birth of GCHQ. Denniston was the first Head of GCHQ and the book was launched at its headquarters on 7 September 2017 in his honour.
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