21 Richest Billionaires In The World

15. Charles Koch

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)
Forbes

Rating: $42.1 Billion

Charles Koch helped turn Koch Industries into the second largest privately owned company in the world with his brother, and moved the company's interests from oil refinement and chemicals into many more lucrative markets.

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