When I was CEO, and I'd listen to music, a lot of people listen to music and you get inspiration from it. And a lot of things in hip hop are very instructive for being in business. Particularly, hip hop is a lot about business, and so it was very useful for me in any job.

It's hard in daily life. It's even harder in management because it's the stress of the moment.

The most important thing you can learn as CEO- one of the hardest things to do is, you have to discipline yourself to see your company... through the eyes of the people that you're working through. Through the eyes of the employees, through the eyes of your partners... through the eyes of the people who you're not talking to and who are not in the room.

Groupon looked like a very high valuation, but any investment in a great company at any stage is almost always a good investment.

Nothing motivates a great employee more than a mission that's so important that it supersedes everyone's personal ambition.

Leadership is hard to train on.

You're better off being The Beatles than The Monkees, as a startup.