Astrophysicist Neil deGrasse Tyson is the Director of the Hayden Planetarium in New York City, host of the PBS series NOVA Science Now and co-host (with comedienne Lynne Koplitz) of the radio show Star Talk. He is the author of nine books including his memoir The Sky is Not the Limit: Adventures of an Urban Astrophysicist and his most recent, The Pluto Files: The Rise and Fall of America's Favorite Planet.