Before the Internet, coordinating more than 100,000 people, let alone paying them, was essentially impossible. But now with the Internet, I've just shown you a project where we've gotten 750 million people to help us digitize human knowledge.

I finished reading High Output Management by Andrew Grove, which had such valuable insights for leaders that I've been forcing managers at Duolingo to read the book.

Every time you buy tickets on Ticketmaster, you help to digitize a book.

I usually make to-do lists with timelines, and pen and paper does the trick for me.

In 2011, after spending a couple of years working at Google, I decided that I wanted to dedicate myself to helping to transform education. I was particularly inspired by my upbringing in Guatemala, a poor country where high-quality educational opportunities are limited to those who have money.

I worked on a number of projects that were used by millions of people and that also served as inspiration to what we now call "crowd-sourcing."

I am an early riser, and always wake up between 5 and 6am.