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

William Alexander won the National Book Award for his debut novel, Goblin Secrets, and won the Earphones Award for his narration of the audiobook. His other novels include A Festival of Ghosts, A Properly Unhaunted Place, Ghoulish Song, Nomad, and Ambassador. William studied theater and folklore at Oberlin College, English at the University of Vermont, and creative writing at the Clarion workshop. He teaches in the Vermont College of Fine Arts MFA program in Writing for Children and Young Adults. Like the protagonist of Nomad and Ambassador, William is the son of a Latino immigrant to the US. Visit him online at WillAlex.net and GoblinSecrets.com, and on Twitter via @WillieAlex.

Ken Jennings was an anonymous Salt Lake City software engineer in 2004 when he unexpectedly became a TV celebrity after his record-breaking seventy-four-game, $2.5 million winning streak on the syndicated quiz show Jeopardy! Today, he is the author of thirteen books, including the New York Times bestsellers Brainiac, Maphead, and Because I Said So!, as well as the Junior Genius Guides for children. In 2020, he was named Jeopardy!’s “Greatest of All Time” after winning a primetime tournament on ABC, and in 2022, succeeded Alex Trebek as a permanent host of the show. He grew up in Seoul, South Korea, but for the last fifteen years has lived in his native Seattle with his family and dogs.

Wesley King is the author of over a dozen novels for young readers. His debut, OCDaniel, is an Edgar Award winner, a Canada Silver Birch Award winner, a Bank Street Best Book of the Year, and received a starred review from Booklist. The companion novel, Sara and the Search for Normal, received a starred review from School Library Journal and was the recipient of the Violet Downey Book Award and the Ruth and Sylvia Schwartz Children’s Book Award. King has also written The Incredible Space Raiders from Space!, A World Below, Butt Sandwich & Tree, and Kobe Bryant’s New York Times bestselling Wizenard series. He lives in Newfoundland.

Mark Kelly has served as the junior US Senator from Arizona since 2020. He was a captain in the United States Navy when he commanded the final mission of space shuttle Endeavour in May 2011. A veteran of four space flights to the International Space Station, he is a graduate of the United States Merchant Marine Academy and holds a master’s degree from the U.S. Naval Postgraduate School.