Stuart Gibbs is the author of five New York Times bestselling series: Spy School, FunJungle, Moon Base Alpha, Charlie Thorne, and Once Upon a Tim--as well as the new nonfiction series Spy School Secret Files. He has written screenplays, worked on a whole bunch of animated films, developed TV shows, been a newspaper columnist, and researched capybaras. Stuart lives with his family in Los Angeles. You can learn more about what he's up to at StuartGibbs.com.

Chris Choi is an illustrator, author, and graphic novelist who formerly worked under the pseudonym "Chris Danger." Chris, an army brat, lived everywhere, but grew up mostly in Hawai'i. He attended the School of Visual Arts in New York City, worked in animation and academia for a few years, and has been a full-time freelance illustrator for almost a decade now. He currently lives in Philadelphia with his wife Eva and their dog and two cats. Visit him on Instagram @Choi_Meets_World.