Some of the world's top billionaires include Bill Gates, Warren Buffet, Carlos Slim Helu and Larry Ellison. Other billionaires include Jeff Bezos, Mark Zuckerberg and Liliane Bettencourt. Several of Sam Walton's heirs are also among the top billionaires in the world.
As of 2015, Bill Gates is the wealthiest person in the world, with a net worth of $79.2 billion. Bill Gates is the founder of Microsoft Corporation, which developed the Windows operating system and related software. Now retired, he focuses on philanthropy through the Bill and Melinda Gates Foundation.
Warren Buffett is the American billionaire closest to matching Bill Gates wealth, with his own net worth of $72.7 billion. Known as the "Oracle of Omaha," Buffett made his money through investments, including the purchase of his company Berkshire Hathaway. He follows the model of value investing taught by his mentor Benjamin Graham, author of the famous book "The Intelligent Investor." Buffett credits his purchase of Graham's book as the single best investment he ever made.
Some of the other top billionaires in the world include technology giants such as Jeff Bezos, founder of Amazon.com; Larry Ellison, founder of Oracle; Mark Zuckerberg, creator of Facebook; and Carlos Slim Helu, founder of the America Movil telecommunications company in Mexico. Also among the world's top billionaires are Liliane Bettencourt, whose father founded L'Oreal, and four heirs of Sam Walton, who founded Wal-Mart.