Founder and CEO, O'Reilly Media
Age: 52
A supporter of the free software and open source movements, O'Reilly built his business on books for techies. But he's better known today for hosting his always-overflowing Web 2.0 conferences. He is also the founding father of the Blogger Code of Conduct, which calls on bloggers to take responsibility for the words printed on their sites and labels their tolerance, if any, for abusive language. Age: 52
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