Birthdate: December 1, 1881
Sun Sign: Sagittarius
Birthplace: Greenock, Renfrewshire, Scotland
Died: January 1, 1961
Commander Alexander “Alastair” Guthrie Denniston was a highly influential Scottish codebreaker who served as the deputy head of the Government Code and Cypher School (GC&CS). He played a key role in Room 40 and was later appointed as the operational head of GC&CS in 1919, a position he held until February 1942. Denniston’s expertise and leadership were crucial to the success of British codebreaking efforts in both World War I and World War II. His significant contributions to intelligence and cryptography greatly impacted Allied operations and strategies during these conflicts.
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