Andrew Rader is the author of the children's book trilogy Epic Space Adventure (which includes Mars Rover Rescue and Europa Excursion) and the nonfiction book Beyond the Known, a history of exploration from the beginning of humanity into our spacefaring future. A SpaceX Mission Manager with a PhD from Massachusetts Institute of Technology specializing in long-duration spaceflight, he is an avid trivia player, space enthusiast, science nerd, history buff, and cohost of the weekly podcast Spellbound, which covers topics from science to economics to history to psychology. He also won the Discovery Channel's competitive television series Canada's Greatest Know-It-All. Andrew Rader lives in Hawthorne, California.

Galen Frazer is a digital artist. When he is not daydreaming about making first contact with an alien intelligence, he is spending time with his amazing daughters, playing guitar, or fishing. He lives in Baltimore, Maryland.