Google cofounder Sergey Brin saw company stock rise 18% over the past year as Google maintained nearly two-thirds of the market for online search. Expanding influence in mobile sector by giving away its Android operating software to phone makers. Brin focuses on raising margins with Instant Search and building new businesses in communications. Emigrated from Russia at age 6. Son and grandson of mathematicians on his father’s side, mother was a research scientist at NASA. Met co-founder Larry Page in computer science Ph.D. program at Stanford and dropped out in 1998 to start Google from a friend’s garage. The two share a 767 jet. Brin is also an investor in Airship Ventures and private space travel company Space Adventures.
Net Worth: $20.4 billion