When I was trying to figure out why lives have improved so much in the last 300 years, where we've gone from a third of kids dying before 5 to - by 1990 it was down to 10% - now it's down to 5%. And saying why, over all history, there were smart people, but that number didn't change. Average life span didn't change. What's magical about what's been deemed the Industrial Revolution? It's really energy intensity.

I’ve been waiting more than 30 years to say this: “Dad, I always told you I’d come back and get my degree.” I want to thank Harvard for this timely honor. I’ll be changing my job next year … and it will be nice to finally have a college degree on my resume.

We believe the world changes when the boldest thinking is directed at the toughest problems

When we face a choice between adding features and resolving security issues, we need to choose security.

If you've found some way to educate yourself about engineering, stocks, or whatever it is, good employers will have some type of exam or interview and see a sample of your work.

Great organizations demand a high level of commitment by the people involved. Eliminate politics, by giving everybody the same message. Keep a flat organization in which all issues are discussed openly. Empower teams to do their own things.

We are always saying to ourself.. we have to innovate. We got to come up with that breakthrough... we're only paid for breakthroughs.