Well, LaTeX is a (slight) improvement over TeX, which was written by D Knuth. I don't think that is what they would give a Turing Award to someone for.
Perhaps in terms of quantity, but to many he is the man who single-handedly brought order to distributed systems. I was surprised he had not won a Turing award yet.
http://www.amazon.com/LaTeX-Document-Preparation-System-2nd/...
I imagine that is how he is best known. I didn't even know he did LaTex, just the book.