A company's founder or CEO is a critical marketing tool.
As the founder of a business, you inevitably wear many hats. And not all of them will suit you, but that's OK. Of course, you play a significant role in developing the product or service offered by your company. This is why you started the business in the first place, and as something you're passionate about, it usually comes easy.
Running a whole company is a different matter, and dealing with HR, legal, finance and other operational issues do not come naturally to all entrepreneurs. But this is something you can get help with, like when Mark Zuckerberg hired Sheryl Sandberg as Facebook's chief operating officer.