One fact we're particularly proud of is that there are more people learning languages on Duolingo in the US than there are people learning languages in the entire US public school system.

I co-founded Duolingo with the mission of bringing free language education to the world.

The current business model for language education is the student pays — in particular, the student pays Rosetta Stone $500. The problem with this business model is that 95 percent of the world’s population doesn’t have $500.

One fact we're particularly proud of is that there are more people learning languages on Duolingo in the US than there are people learning languages in the entire US public school system.

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.

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