Donald Knuth. TeX. Also, pioneer of fundamental algorithms.

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    Elaborating on the TeX thing, it is said that all he wanted was a way to typeset his other works, and he was unhappy with all existing solutions because they produced bad-quality results, plus no one had yet thought of separating creating contents from formatting and layouting.

    So he just went and did it himself. That's a spirit I admire!

    And he ended up creating something that continues to be a standard these days. I know for a fact that large real-world publishers (I used to work for one) do use LaTeX to typeset the books they produce.
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