Tesla and SpaceX are some of the most innovative companies today, making huge strides in the electric car and commercial spaceflight industries.

At the helm of both companies is CEO Elon Musk, the South African-born self-made billionaire.

Musk has often been compared to the Tony Stark character as portrayed in the "Iron Man" movies. He knows how to have a good time when he's on top, and doesn't hold back when he's criticized.

He's also the sexiest CEO in the world.

Elon Musk is America's most badass CEO, and these photos prove it.