21 Richest Billionaires In The World

10. S Robson Walton

Facebook CEO Mark Zuckerberg talks about the new Facebook email service at an announcement in San Francisco, Monday, Nov. 15, 2010. AP Photo/Paul Sakuma)
April L Brown/AP

Rating: $38.2 Billion

Son of Sam Walton - the founder of Walmart - Robson is also the company's chairman having joined the company in 1978.

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