An entrepreneur must deal with more uncertainty than a professional with a well-defined role.

When I was starting out, I followed along the path that seemed to be marked out for me - from high school to college to law school to professional life.

People don't want to believe that technology is broken. Pharmaceuticals, robotics, artificial intelligence, nanotechnology - all these areas where the progress has been a lot more limited than people think. And the question is why.

Credentials are critical if you want to do something professional. If you want to become a doctor or lawyer or teacher or professor, there is a credentialing process. But there are a lot of other things where it's not clear they're that important.

I hear the same anxieties over and over again. Everything is too fast; everything is too precarious. We have more access than ever to the people we are trying to reach, thanks to social media and mobile technology, and more information than we know what to do with.

It got to the point in the late 70s and early 80s that I was spending so much money buying golden age comics that I could only justify it if I got work in the media.

If you want to make more money, you'll have to do things differently. You will have to do things you never even thought of doing in the past. You will have to do things out of your comfort zone.

Half the money I spend on advertising is wasted; the trouble is, I don't know which half.