Walter Lewin taught the three core classes in physics at MIT for more than thirty years and made major discoveries in the area of X-ray astronomy. His physics lectures have been the subject of great acclaim, including a 60 Minutes feature, stories in the New York Times, Washington Post, Boston Globe, Newsweek and US News and World Report. They have also been top draws on YouTube and iTunes University. He was awarded three prizes for excellence in undergraduate teaching. He has published more than 450 scientific articles, and his honors and awards include the NASA Award for Exceptional Scientific Achievement, the Alexander von Humboldt Award, and a Guggenheim Fellowship. He became a corresponding member of the Royal Netherlands Academy of Arts and Sciences and Fellow of the American Physical Society in 1993. He lives in Cambridge, Massachusetts.