According to
History of computing,
Alan Turing was a major participant in the development of Colossus
He was a major participant in the code breaking efforts at Bletchley Park and contributed several mathematical insights, both to breaking the Engima code and the Lorenz code. He also built the "bombe" there, an electromechanical code breaking device for the Enigma code. He didn't play a major role in design or construction of Colossus; that was Newman's deal.
See http://www.computer50.org/mark1/turing and http://www.turing.org.uk/turing/scrapbook/ww2
--AxelBoldt
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Okay, I'll update Alan Turing's article to include that paragraph...
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