According to the citation, the Turing Award was: For his influence in the area of advanced programming techniques and compiler construction. This is a reference to the work he had done as a member of the team that developed the ALGOL programming language
In 1982, he wrote an article for ACM's SIGPLAN journal, Epigrams In Programming, describing in one_sentence distillations many of the things he had learned about programming over his career. The epigrams have been widely quoted.
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The award is named after Alan Mathison Turing, a British mathematician considered to be one of the fathers of modern computer science.
In joint scientific efforts extending over twenty years, initially in collaboration with J. Shaw at the RAND Corporation, and subsequentially with numerous faculty and student colleagues at Carnegie Mellon University, they have made basic contributions to artificial intelligence, the psychology of human cognition, and list processing
For their joint paper "Finite Automata and Their Decision Problem," which introduced the idea of nondeterministic machines, which has proved to be an enormously valuable concept.
Girdner, Eddie J. Economic Liberalization in India: The New Electronics Policy. Asian Survey 27 (November 1987): 1188-1204.
Hoffman, AlanJ. Linear Programming at the National Bureau of Standards. In History of Mathematical Programming, a Collection of Personal Reminiscences, 62-4.
Jeenel, J. Programs as a Tool for Research in Systems Organization. IBM Journal of Research and Development 2 (April 1958): 105-22.