John Ferris is a Professor of History at the University of Calgary, where he also is a Fellow at the Centre for Military and Strategic Studies. He received a PhD in War Studies from King's College London. He has published four books and numerous academic articles on diplomatic, intelligence and military history, as well as contemporary strategy and intelligence.

You know about MI5.

You know about MI6.

Now uncover the story behind Britain's most secretive intelligence agency in the first-ever authorised history of GCHQ.

Coming October 2020.