Failure can teach you something, and as long as you're moving very, very quickly, you're going to start piling up the wins. Speed gives you the luxury to be able to fail.

When you go to a voice-based interaction, you can't tell people, 'Ask me this question and structure it in this way.' And if they ask a question, and you have a bad answer, first time, maybe they'll be okay with it. Third time, they're going to say, 'This is a complete waste of time. I'm going away.'

As we move over to more of a mobile device-centric world... I think the interaction model with devices is going to be much more voice-based.

Any time there's significant change, there's going to be some people who embrace the change and others who are against the change.

If you don't optimize for the consumer on the Internet, you're dead.

Uber is a company that is redefining the transportation industry on a global basis; to be part of that story is something that is interesting and would be a real privilege.