Scott Joseph Kelly is an engineer, retired American astronaut, and a retired U.S. Navy Captain. A veteran of four space flights, Kelly commanded the International Space Station on Expeditions 26, 45, and 46.
Carl Zimmer is a popular science writer and blogger who has specialized in the topics of evolution and parasites. He has authored many books and contributes science essays to publications such as The New York Times, Discover, and National Geographic.
Andrew E. "Andy" Rubin is an American computer programmer, engineer, entrepreneur, and venture capitalist. He is the founder and CEO of tech startup incubator Playground Global and a partner at venture capital firm Redpoint Ventures.