He's a technologist, venture capitalist, social experimenter, philanthropist, and Russian-trained space traveler. Oh, and Mark Shuttleworth originated the world's fastest-growing Linux distribution, Ubuntu.

IW: Why are you concerned about ease of use when many Linux developers see it as a lesser issue?

Shuttleworth: I'm not brilliant technically like Linux Torvalds. I feel the gaps in Linux usability personally. When you're an exceptional developer, you can be blinded to the ease of use issues. Besides, people gravitate to the problems that they're best equipped to help fix.

IW: Is there a social concern behind your ease of use drive?

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Sidebar of 15 Innovators & Influencers Who Will Make A Difference In 2008