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As a gamer, I’ve got to add John Carmack, co-founder of Id Software, to the list. It may be easy to forget how far they moved the goalposts, but Wolfenstein 3D, Doom and Quake were revolutionary at the time and have influenced a generation of game designers. Add in his enthusiastic embrace and support of open source software and I think you have a potential winner. He’s not done yet, though - he is currently involved in the Oculus Rift project.
I think Petr Mitrichev has to be a top contender. He has done consistently well at TopCoder competitions, winning a number of annual algorithm tournaments (where he has the highest score of all time), as well as dozens of individual matches. He also won Google Code Jam in 2006 and the Facebook Hacker Cup in 2011 and 2013. Here is a link to his blog on competitive programming: http://petr-mitrichev.blogspot.com/
Linus Torvalds, of Linux fame, is another somewhat obvious choice.