Ann Katharine Mitchell (née Williamson; 19 November 1922 – 11 May 2020) was a British cryptanalyst and psychologist who worked on decrypting messages encoded in the German Enigma cypher at Bletchley Park during the Second World War. After the war she became a marriage guidance counsellor, then studied for a Master of Philosophy at the University of Edinburgh. She worked at the university's Department of Social Administration and wrote several academic books about the psychological effects of divorce on children, including Someone to Turn to: Experiences of Help Before Divorce (1981) and Children in the Middle: Living Through Divorce (1985).
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Early life and education
Ann Williamson was born in Oxford on 19 November 1922, to Herbert Stansfield Williamson and Winifred Lilian Williamson (née Kenyon). Herbert had previously worked in the Indian Civil Service; Winifred had helped organise one of the first family planning clinics in Britain.