June 24, 1917 – September 4, 1996
Working alongside Alan Turing and other codebreakers at England's famous Bletchley Park during World War II, Joan Clarke was considered among the most brilliant mathematicians on staff.
She faced many hurdles in her career due to her gender. One famous example of this occurred when, as no suitable senior codebreaking position existed at Bletchley to which a female was allowed to be promoted, she was granted the title of "linguist" to grant her some measure of recognition for her work. Clarke, who spoke no second language, would later recall with bemusement filling out paperwork with "grade: linguist, languages: none."