Batutta
Major Contributor
This is as big a deal as Steve Jobs dying, maybe more so depending on your point of view. He invented the C programming language, which is responsible for just about everything.
http://www.wired.com/wiredenterprise/2011/10/thedennisritchieeffect/
http://www.wired.com/wiredenterprise/2011/10/thedennisritchieeffect/