Joan CLARKE, later Mrs Murray (1917–1996)
Joan Elisabeth Lowther Clarke was a clergyman's daughter, born on 24 June 1917 in West Norwood, London.
She gained a double-first in Mathematics at Newnham College, Cambridge. In June 1940 she joined the Government Code and Cypher School (GCCS) at Bletchley Park, where she was the only woman in Hut 8 working on the Naval Enigma Code. One of the three men working there was Alan Turing, who was a friend of her brother, and for a brief period in 1941 she was engaged to him.
After the war Joan worked for GCHQ (as GCCS had become).. Here she met Lieutenant-Colonel John Kenneth Ronald Murray, a retired army office, and they were married in 1952: they had no children.
Murray suffered from ill health, and shortly after their marriage they moved to Crail in Scotland, where Joan gained an interest in numismatic history from her husband.
In 1962 they moved to Cheltenham, and Joan rejoined the CGHQ.
Joan retired in 1977 at the age of 60, and developed her interest in Scottish numismatic history.
Following her husband's death in 1986, Joan Clarke Murray moved to 7 Larkfields in Headington Quarry (right)
She continued her work as a numismatist here, winning the British Numismatist Society's Sanford Saltus medal in 1987 for her research into coinage in circulation during the reigns of kings James III and James IV of Scotland.
She died at 7 Larkfields at the age of 79 on 4 September 1996.
Joan was portrayed by Keira Knightly in the 2014 film The Imitation Game, opposite Benedict Cumberbatch, who played Turing:
Hers was one of the ten images on “Trailblazers” posters unveiled in March 2017 to mark Women's History Month:
- Oxford Mail, 28 February 2017:
“Bletchley Park codebreaker and Oxford resident Joan Clarke immortalised in Sage UK poster series”