40 Under 40

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Lyndon Rive

Photograph by Gregg Segal for Fortune; Grid Photo: Pat Greenhouse—Getty Images
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The South African native (and cousin of Tesla CEO Elon Musk) is co-founder and CEO of SolarCity, the largest installer of solar panels in the U.S. (See related story for more, here) The San Mateo, Calif. Company’s leasing revenue (the main driver of its business) was up 110% last quarter; after going public in 2012 at $8 a share, it traded recently at $60, giving it a $5.5 billion market value.