Neil deGrasse Tyson is an astrophysicist and one of the most famous science communicators alive today. He directs New York's Hayden Planetarium, where his exhibit's decision to leave Pluto out of the display of planets helped spark the debate that led to Pluto's reclassification as a dwarf planet. He hosted Cosmos: A Spacetime Odyssey, a followup to Carl Sagan's classic series, along with other television shows that make space and science exciting for millions of people. He is known for explaining big, complicated ideas about the universe in ways anyone can understand.