Sergey Brin Net worth: $17.5 billion The Google cofounder's hot streak brings him up a couple of rankings to 24th richest in the world. His fortune grew $5.5 billion as shares of the search giant rose 70% in past year. Google revenues hit $23.7 billion. Unveiled smart phone Nexus One in January; operates with Android software. Announced upgraded version of Chrome browser in March. Emigrated from Russia, met future partner Larry Page at Stanford; duo dropped out of computer science Ph.D. program in 1998. Brin introduced goats to Google's campus last year, since animals are less harmful to the environment than lawn mowers. Larry Page Net worth: $17.5 billion The surge in Google stock pushed up cofounder Page's fortune by $5.5 billion and lands him as 24th richest. Google continues to dominate search, though it has seen Microsoft's Bing search engine--launched in 2009--take a slice of its market share. The company has moved into mobile phones and mobile software with the January launch of its Nexus One smart phone, which uses its Android operating system software. Google Apps--including Google Docs and Google Calendar--are a $750 million piece of the overall business and growing. Page met Brin at Stanford, where the pair founded Google.