Alan Mathison Turing, (23 June 1912 – 7 June 1954) was a British mathematician, logician, cryptanalyst and computer scientist. He was highly influential in the development of computer science, giving a formalisation of the concepts of "algorithm" and "computation" with the Turing machine, which can be considered a model of a general purpose computer. Turing is widely considered to be the father of theoretical computer science and artificial intelligence.
Congratulations to tchas for the FTF!