USA - 1994
Edsger Dijkstra was a principal contributor in the late 1950's to the development of the ALGOL, a high level programming language which has become a model of clarity and mathematical rigor. He is one of the principal exponents of the science and art of programming languages in general, and has greatly contributed to our understanding of their structure, representation, and implementation. His fifteen years of publications extend from theoretical articles on graph theory to basic manuals, expository texts, and philosophical contemplations in the field of programming languages.
Netherlands - 1972READ FULL CITATION AND ESSAY
For fundamental contributions to programming as a high, intellectual challenge; for eloquent insistence and practical demonstration that programs should be composed correctly, not just debugged into correctness; for illuminating perception of problems at the foundations of program design.
[Extract from the Turing award Citation ready by M.D. McIlroy, chairman of the ACM Turing Award Committee, at the presentatiion of his lecture on August 14, 1972, at the ACM Annual Conference in Boston.]
USA - 1971
The structure of the THE-multiprogramming system, Communications of the ACM, May 1968