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Alexander, (Conel) Hugh O'Donel (1909–1974), chess player and cryptanalyst  

Harry Golombek

revised by Ralph Erskine

Alexander, (Conel) Hugh O'Donel (1909–1974), chess player and cryptanalyst, was born in Cork on 19 April 1909, the eldest of four children of Conel William Long Alexander (1879–1920), professor of engineering at University College, Cork, and his wife, Hilda Barbara Bennett (1881–1964), of ...

Article

Bamforth [née Ince], Rosemary Margaret Warren (1924–2018), codebreaker and pathologist  

Anne Pimlott Baker

Bamforth [née Ince], Rosemary Margaret Warren (1924–2018), codebreaker and pathologist, was born on 19 October 1924 at 31 Kersland Street, Hillhead, Glasgow, the younger child of Douglas Edward Ince (1890–1966), farmer and businessman, and his wife, Isobel Margaret, née...

Article

Barry, Sir (Philip) Stuart Milner- (1906–1995), code-breaker and chess player  

Ralph Erskine

Barry, Sir (Philip) Stuart Milner- (1906–1995), code-breaker and chess player, was born on 20 September 1906 in Hendon, London, the second youngest of six children (five sons and one daughter) of Edward Leopold Milner-Barry, a schoolteacher (later professor of modern languages at the ...

Article

Batey [née Lever], Mavis Lilian (1921–2013), code-breaker and garden historian  

David Lambert

Batey [née Lever], Mavis Lilian (1921–2013), code-breaker and garden historian, was born on 5 May 1921 at 20 Crebor Street, Dulwich, London, the only daughter and younger child of Frederick (formerly Fred, later Stanley Frederick) Lever (1887/8–1971) and his wife, Lily Elizabeth, ...

Article

Blencowe, William (1683–1712), cryptographer  

T. F. Henderson

revised by Philip Carter

Blencowe, William (1683–1712), cryptographer, was born on 6 January 1683, the third son of Sir John Blencowe (1642–1726), a judge and baron of the exchequer, and his wife, Anne Blencowe (1656–1718), the eldest daughter of the mathematician and cryptographer John Wallis. He matriculated at ...

Article

Bonsall, Sir Arthur Wilfred [Bill] (1917–2014), intelligence officer and civil servant  

David Omand

Bonsall, Sir Arthur Wilfred [Bill] (1917–2014), intelligence officer and civil servant, was born on 25 June 1917 at 1 Clairville Road, Middlesbrough, the elder son of Wilfred Cook Bonsall (1888–1963), a private in the Machine Gun Corps and later company secretary at ...

Article

Cooper, Joshua Edward Synge (1901–1981), cryptanalyst and intelligence officer  

D. R. Nicoll

revised

Cooper, Joshua Edward Synge (1901–1981), cryptanalyst and intelligence officer, was born on 3 April 1901 in Fulham, the son of Richard Edward Synge Cooper, a chartered engineer, and his wife, Mary Eleanor, youngest daughter of William Burke. Joshua was the eldest of five children, four sons and a daughter, all brought up in ...

Article

Denniston, Alexander Guthrie [Alastair] (1881–1961), cryptanalyst and intelligence officer  

F. H. Hinsley

revised by Ralph Erskine

Denniston, Alexander Guthrie [Alastair] (1881–1961), cryptanalyst and intelligence officer, was born on 1 December 1881 at Greenock, the eldest child of James Denniston, a medical practitioner, and his wife, Agnes Guthrie. He was educated at Bowdon College, Cheshire, and at the universities of ...

Image

Cover Denniston, Alexander Guthrie (1881–1961)

Denniston, Alexander Guthrie (1881–1961)  

Maker: Lafayette

In 

Alexander Guthrie Denniston (1881–1961) by Lafayette, 1933 © National Portrait Gallery, London

Article

Ewing, Sir (James) Alfred (1855–1935), engineer and cryptographer  

E. I. Carlyle

revised by W. H. Brock

Ewing, Sir (James) Alfred (1855–1935), engineer and cryptographer, was born on 27 March 1855 at 109 Nethergate, Dundee, the youngest of the three sons of James Ewing (1810–1886), minister of St Andrew's Free Church, Dundee, and his wife, Marjory, eldest daughter of John Ferguson...

Image

Cover Ewing, Sir (James) Alfred (1855–1935)

Ewing, Sir (James) Alfred (1855–1935)  

Maker: Bassano

In 

Sir (James) Alfred Ewing (1855–1935) by Bassano, 1915 © National Portrait Gallery, London

Article

Foss, Hugh Rose (1902–1971), cryptanalyst  

Michael Smith

Foss, Hugh Rose (1902–1971), cryptanalyst, was born on 13 May 1902 in Kobe, Japan, one of five children of Hugh James Foss (1848–1932), Anglican bishop of Osaka, and his wife, Janet Ovans (b. 1870). He was educated at Hoylake, at Marlborough College...

Article

Grey, Nigel Arthur de (1886–1951), cryptanalyst  

Nigel West

Grey, Nigel Arthur de (1886–1951), cryptanalyst, was born on 27 March 1886 at the rectory, Copdock, Suffolk, the son of the Hon. Arnold de Grey (b. 1856), rector of Copdock, and his wife, Margaret Maria Ponsonby Fane. His father was the son of the ...

Article

Hilton, Peter John (1923–2010), code breaker and mathematician  

I. M. James

Hilton, Peter John (1923–2010), code breaker and mathematician, was born at 34 Castletown Road, West Kensington, London, on 7 April 1923, the son of Mortimer Jacob Hilton (1893/4–1959), a physician and surgeon who practised in Peckham, south London, and his wife, Elizabeth Amelia, ...

Article

Hinsley, Sir (Francis) Harry (1918–1998), cryptanalyst and historian  

Richard Langhorne

Hinsley, Sir (Francis) Harry (1918–1998), cryptanalyst and historian, was born on 26 November 1918 at 28 Rowland Street, Walsall, the son of Thomas Henry Hinsley, ironworks waggoner, and his wife, Emma, née Adey. He went to the local elementary school and then to ...

Article

Knox, (Alfred) Dillwyn (1884–1943), classical scholar and cryptographer  

Mavis Batey

revised

Knox, (Alfred) Dillwyn (1884–1943), classical scholar and cryptographer, was born on 23 July 1884 in Oxford, the fourth of six children (four sons and two daughters) of the Revd Edmund Arbuthnott Knox (1847–1937), a tutor at Merton College (later bishop of Manchester), and his first wife, ...

Article

Marks, Leopold Samuel [Leo] (1920–2001), cryptographer, playwright, and screenwriter  

M. R. D. Foot and Alan Burton

Marks, Leopold Samuel [Leo] (1920–2001), cryptographer, playwright, and screenwriter, was born at 71 Antrim Mansions, Hampstead, London, on 24 September 1920, the only child of Benjamin Marks, antiquarian bookseller, and his wife, Rachel Dorothy, née Joseph. He was a bright child—at the age of eight, he claimed, he had solved his father's and his uncle's book-pricing codes—and was noted at ...

Article

McVittie, George Cunliffe (1904–1988), astronomer and cryptanalyst  

Ralph Erskine

McVittie, George Cunliffe (1904–1988), astronomer and cryptanalyst, was born on 5 June 1904 in Smyrna, Turkey, the eldest of three children (two sons and a daughter) of Francis Skinner McVittie (1872–1950), businessman, and his wife, Emily Caroline (1877–1942), daughter of George Weber from ...

Article

Mitchell [née Williamson], Ann Katharine (1922–2020), mathematician, code-breaker, and social policy researcher  

Anne Pimlott Baker

Mitchell [née Williamson], Ann Katharine (1922–2020), mathematician, code-breaker, and social policy researcher, was born on 19 November 1922 at 26 Norham Road, Oxford, the only daughter and eldest of three children of Herbert Stansfield Williamson (1877–1955), a former commissioner in ...

Article

Murray [née Clarke], Joan Elisabeth Lowther (1917–1996), cryptanalyst and numismatist  

Ralph Erskine

Murray [née Clarke], Joan Elisabeth Lowther (1917–1996), cryptanalyst and numismatist, was born at 45 Idmiston Road, West Norwood, London, on 24 June 1917, the youngest child (there were three sons, and another daughter) of William Kemp Lowther Clarke, a Church of England...