De Grey joined the British Room 40 codebreaking section in early 1915, from the publishing firm of William Heinemann. De Grey, together with Reverend William Montgomery, decrypted the Zimmermann Telegram on 17 January 1917. The Zimmermann Telegram was from the German foreign secretary Arthur Zimmermann to the German ambassador Heinrich von Eckardt in Mexico, and led in part to the US entering World War I.
Recognition That Is Long Overdue for a National Hero; More Than 40 Years after His Death, One Man's War Efforts Are Being Celebrated COVER STORY . . . THE CODE CRACKER .
Mar 17, 2007; Byline: By RICHARD McCOMB The death of 79-year-old Alastair Guthrie Denniston, a retired British intelligence officer, went...