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I build systems that combine humans and computers to solve large-scale problems that neither can solve alone. I call this Human Computation, but others sometimes call it Crowdsourcing. Some of my past projects include: CAPTCHA, The ESP Game (acquired by Google), GWAP, and reCAPTCHA (acquired by Google).
I'm currently working on Duolingo.
Duolingo: Translating the Web with Millions of People
as author at 26th AAAI Conference on Artificial Intelligence, Toronto 2012,
as author at 21st Conference on Innovative Applications of Artificial Intelligence,