Christine Taylor-Butler is the author of more than ninety fiction and nonfiction books and articles for children. A graduate of MIT, she holds degrees in both civil engineering and art and design. She has served as a past literary awards judge for PEN America and for the Society of Midland Authors. She is an inaugural member of steaMG, an alliance of middle grade science fiction authors, and a contributor to STEM Tuesday. She lives in Kansas City with her husband, Ken, and a cat who thinks he's a dog. You can visit her online at christinetaylorbutler.com and follow her on Twitter @christinetb.

Chelsea Clinton is the author of the #1 New York Times bestseller She Persisted: 13 American Women Who Changed the World; She Persisted Around the World: 13 Women Who Changed History; She Persisted in Sports: American Olympians Who Changed the Game; She Persisted in Science: Brilliant Women Who Made a Difference; Don't Let Them Disappear: 12 Endangered Species Across the Globe; It's Your World: Get Informed, Get Inspired & Get Going!; Start Now!: You Can Make a Difference; with Hillary Clinton, Grandma's Gardens and The Book of Gutsy Women: Favorite Stories of Courage and Resilience; and, with Devi Sridhar, Governing Global Health: Who Runs the World and Why? She is also the Vice Chair of the Clinton Foundation, where she works on many initiatives, including those that help empower the next generation of leaders. She lives in New York City with her husband, Marc, their children and their dog, Soren. You can follow Chelsea Clinton on Twitter @ChelseaClinton or on Facebook at facebook.com/chelseaclinton.