I seriously doubt whether anyone can beat Elon Musk when it comes to hard work! Having studied physics and business, he developed himself into a talented engineer with enough real world knowledge to know what he can change, which is quite a lot based on his skill in his case.
I would love to work for him, for free even, if only to help make this world a better place. But since I'm in the Netherlands, and most of Elon's companies are in the United States, I guess that is out of the question for now, since as a boss Elon insists on physical presence of those he works with. I can understand that totally, but it does pose a hurdle in this case.