Q: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
This man and Donald Bayley created a secure voice communications machine called "Delilah". The Chinese Room Experiment was developed by John Searle in response to one of this man's namesake tests. He showed that the halting problem was undecidable. He devised a bombe with Gordon Welchman that found the settings of an Enigma machine. One of this man's eponymous machines which can perform any computing task is his namesake "complete." Name this man, whose eponymous test is used to determine if a machine can exhibit behavior indistinguishable from that of a human.
A:
History