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Keith L. Clark is a Professor of Computer Science at Imperial College London, England. He has lectured in both mathematics and computer science. Since 1979 he has had a tenured position in the Department of Computing, Imperial College London, where he has been Professor of Computational Logic since 1987. Between 1987 and 1995 he was also Visiting Professor at Uppsala University. He is currently a Visiting Professor at BTH (since 1997), and at the University of Queensland (since 1998). In 1980 he co-founded an Imperial College spin-off company, Logic Programming Associates, to develop and market Prolog systems for micro-computers (micro-Prolog) and to provide consultancy on expert systems and rule based applications.

His key contributions have been in the field of logic programming. His 1978 paper on negation as failure was arguably the first formalisation of a non-monotonic logic. His 1981 paper on a relational language for parallel programming introduced concurrent logic programming.

Recently he has been working on the April and Go! programming languages and their application to agent programming.

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