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4. Jeff Bezos

4-jeff-bezos

David Ryder/Getty Images

Net worth: $56.6 billion

Age: 51

Country: US

Industry: Tech

Source of wealth: Self-made; Amazon.com

Jeff Bezos earned his massive fortune by introducing e-commerce to the world. After spending time in finance on Wall Street, Bezos founded Amazon.com in the garage of his Seattle home in 1994 and operated it exclusively as an online book retailer. The company went public three years later and has since grown to include everything from furniture to food to Amazon’s own consumer-electronics products, generating $107 billion in sales in 2015.

While Bezos, chairman and CEO, faced a barrage of negative media attention last year for reports that Amazon’s warehouses are high-pressure, toxic work environments — claims he disputed — the internet retailer continues to thrive with the growth of Amazon Web Services, the company’s cloud-computing branch, and a bold plan to conquer India’s “trillion dollar” online-retail market.

Bezos also has interests outside of Amazon, including investments in his privately owned space company Blue Origin, which successfully launchedits first spacecraft in 2015, and The Washington Post, the newspaper he bought in 2013. And early this month he invested millions in a company that’s creating a simple blood test to detect every form of cancer.

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