Dr Alan Stern is Principal Investigator of the New Horizons mission. A planetary scientist, space program executive, aerospace consultant, and author, he has participated in numerous planetary missions. He lives in Colorado. Dr David Grinspoon is an astrobiologist, award-winning science communicator, author, and the inaugural Chair of Astrobiology at the Library of Congress. He is a frequent adviser to NASA on space exploration strategy and lives in lives in Washington, DC.