Dennis Ritchie, with
Ken Thompson and others, developed the first versions of the
Unix operating system. Probably Ritchie's most important contribution was to develop the
C programming language, in which
Unix was (re)written. With
Brian Kernighan, he wrote the seminal
C book: The C Programming Language.
His home page is http://www.cs.bell-labs.com/who/dmr/
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