Is there anyone more audacious than the CEO of Tesla and Space X? We doubt it. Elon Musk is the very embodiment of audacity, having already disrupted the online payments, space, solar power, and cars industries. He thinks really, really big and knows how to make those big ideas happen. So it's not hard to understand why most CEOs on this year's Inc. 500, our annual list of the fastest-growing private companies in the U.S., admire him. Plus, who can argue with a guy who's been named Inc.'s entrepreneur of the year?  

Take a look at who else CEOs look up to: 

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