Niklas Zennstrom

If you want to be an entrepreneur, it's not a job, it's a lifestyle. It defines you. Forget about vacations, about going home at 6 pm - last thing at night you'll send emails, first thing in the morning you'll read emails, and you'll wake up in the middle of the night. But it's hugely rewarding as you're fulfilling something for yourself.

My dad was an editor and a writer, and that's really where I would have liked to have gone. But the genetic link was not intact there, so I wound up going into business. But I love to write, still. I'm not a great writer, but I enjoy it.