From Geek Feminism Wiki featured article on 6.12.13:
Karen Spärck Jones, the University of Cambridge
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Karen Spärck Jones (1935–2007) was a British computer scientist. Her specialties were natural language processing and information retrieval. Spärck Jones had a long history in experimental investigations of human language and was the originator of the Inverse Document Frequency measure in information retrieval. Awards Spärck Jones won in her lifetime include Fellowships of the American and European Artificial Intelligence societies, Fellowship of the British Academy, the ACL Lifetime Achievement Award and the Lovelace Medal of the British Computer Society.
Spärck Jones advocated for greater representation of women in computer science. Her slogan was “computing is too important to be left to men.”