- Was it an OS?
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- No.
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Remember that he has been mentioned on the forum, we should be able to severely narrow down the range of possibilities now
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I was thinking we make a shortlist and proceed in binary. It was just too boring a thing to do hehe. But knowing it is someone who developed a programming language is already narrow enough.
Edit: I guess I was taking the AlphaGo approach: It doesn’t matter by how many questions you win, but that you increase the probability of winning.
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On the contrary, see it as a highscore, if we can get him with the next question, we only needed 14 to find out who it is 
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I suspect that he worked with either Conway or Berlekamp.
Did Donald Knuth ever develop a programming language? Is TeX a programming language?
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I don’t think Fractran counts, that’s far too theoretical. In fact I didn’t even remember that, I don’t think people would usually just pull that factoid our of memory.
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But, sadly, it’s not Conway:
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Too soon.
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@Samraku, as clarification to question 12, do you consider TeX a programming language? If so, solve for Knuth
Because I can’t find any other candidates…
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Hmmmm, I don’t think TeX qualifies as “used by almost everyone”. Html would though.
Edit: I might be wrong though. A lot of people have encountered PDFs in their lives.
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Yes, but HTML was developed by Tim Berners-Lee, who isn’t mentioned here. Also, if TeX is not a programming language, then HTML isn’t either.
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I take forums to mean anywhere on any thread, is that what you mean as well?
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Yes, I use the search function on the top bar to check, which goes through all posts, as far as I’m aware.
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I guess Donald Knuth is the best guess here.
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I would consider TeX a programming language, but if you don’t, Knuth did create MIX.
So you win, @Vsotvep! 
And surreal numbers were the connection to John Conway I was thinking of.
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We’re doing whoever wins goes next right?
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