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.
Dave Smith is an engineer and musician who has pioneered many groundbreaking music technologies. Smith was responsible for the first polyphonic and microprocessor-controlled synthesizer, the Prophet 5, and later the multitimbral synthesizer.
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.