Marc Andreessen

Nearly two decades ago, Marc Andreessen co-created the first popular Web browser. Now he's the man to see for Internet start-up funding. With partner Ben Horowitz, Andreessen, 40, has raised a $2.7 billion war chest, which he's invested in major players (Facebook, Twitter) and rising stars (Pinterest, Instagram) in the platform he helped invent.

McCracken is an editor-at-large at TIME

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