The biggest problems were to do with... well, to get that successful when you're so young, it attracts hangers-on, parasites, people who want to feed off you. I thought people actually liked me, but they actually liked my money. I'd probably say to my younger self, get yourself a whole collection of lawyers. Which is what I have now. I don't have any friends; I just have lawyers. At the last count I had about 15 different sets of them for all kinds of problems. And you can trust them because you're paying them. I know that sounds very negative, but that's the world we live in.

It was a very academic environment. That became frustrating because there was no pressure for results. I thought commercial applications would be more rewarding. But since then I’ve met too many people who want to make a career out of a project instead of completing it. That’s life.