'Shark Tank' has been a sincere joy. As our traditional venture-backed companies get bigger, the investing side tends to get more political and complicated. 'Shark Tank' takes me back to my early days working with ambitious founders in their earliest and scrappiest days. The show reminds me of what I deeply love about this business.

Travis Kalanick was and is the perfect person to lead Uber, a product I knew from day one was going to be big.

When I first agreed to do 'Shark Tank,' they asked me to wear a suit, and I was just like, 'No. I can't. It'll end my career.'

Ride-sharing is one of the biggest math problems that's ever been approached, that's ever been attempted to be solved.

My biggest concern is the abundance of public doubt and misunderstanding when it comes to Twitter's vision and the near future for the service.

I've learned that it's often the less obvious, yet pervasive and questionable, everyday behaviors of men in our industry that collectively make it inhospitable for women.

I have learned a ton about inventory, co-packing, wholesaling, end caps. All these concepts are easy to breeze by in what I do for a living or assume that there is a marketing manager or specialist in one of our companies that handles that.

I think our election proved to us that 'billionaire' is an incredibly magical word in our language in that people just defer to it. Donald Trump is not a billionaire, but he knew it was vital for him to be perceived as one.

The better I get at investing in and helping companies, the result is more founders who are excited to work with me and more of my wonderful limited partners insisting I take piles of their loot to keep it all going.

I have one of the self-driving Teslas; it drives itself periodically. It's a marvel of science, but it's still frightening. I think we've got a while before regulators and the general public wrap their heads around the path that will lead to the ubiquity of driverless cars. There's no doubt Uber will be a leader in that space.