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

The right answer on raises is you have to be formal. You have to be formal to save your own culture.

It turns out that is exactly what product strategy is all about—figuring out the right product is the innovator’s job, not the customer’s job.

In my experience as CEO, I found that the most important decisions tested my courage far more than my intelligence.

The one thing with stress is, you've got to keep your focus on what you can do, not what happened to you.

In life, everybody faces choices between doing what's popular, easy, and wrong vs. doing what's lonely, difficult, and right. These decisions intensify when you run a company, because the consequences get magnified 1,000 fold. As in life, the excuses for CEOs making the wrong choice are always plentiful.

One of the great things about building a tech company is the amazing people that you can hire.