Luis von Ahn, Ph.D. has served as our Chief Executive Officer and a member of our board since founding Duolingo with Severin Hacker in August 2011. Previously, he served as the Chief Executive Officer of reCAPTCHA from 2007 until its acquisition by Google in 2009. Luis holds a B.S. in Mathematics from Duke University and a Ph.D. in Computer Science from Carnegie Mellon University.