Startup CEOS are forced to learn to be proficient in numerous areas. The 80/20 rules applies well startup CEOS. They don't have to spend years in school in a specific subject to have great use of it. There is no a way a person can be an expert in programming, design, finance, marketing, and so on. However being an expert doesn't mean you have utilized your knowledge in the most useful ways possible.

Good startup CEOs are able to recognize what is worth learning and how to tie different aspect of his knowledge together. I would be willing to take advice in may areas from a good Entrepreneur.

This is why take advice from PG on everything from how to be a great programmer, entrepreneur, angel investor, and much more.