19) Ken Grossman (Net worth: $1 billion)

Beer baron Ken Grossman is the founder of Sierra Nevada brewery, whose famous Pale Ale accounts for around 60 percent of the company’s sales. In 2010, the brewery was named “Green Business of the Year,” around 99.8 percent of the company’s waste is recycled.

18) Charles Edelstenne (Net worth: $1 billion)

This 77-year-old self-made billionaire is a qualified accountant. He is the co-founder and chairman of Dassault Systemes, a French software company that specializes in production and 3D design software, 3D digital mock-up and PLM solutions.

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