Pierre Omidyar
Age: 42
Last list appearance: 2004
Then: Founder and chairman, eBay
Now: Founding partner, Omidyar Network
Pierre Omidyar has the rare distinction of having launched a tech startup -- eBay -- that became exactly the game-changer that its founder intended. After a quick three years as CEO, in 1998 Omidyar turned over the reins to company woman Meg Whitman. Later that year, she handled the company's public offering, which made Omidyar an instant billionaire.
These days, he's busy with his new career as a philanthropist: Since its inception in 2004, his Omidyar Network has committed $307 million to charities and for-profit startups focused on social change.
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