Tommy Greenwald is the author of Game Changer, Rivals, and Dinged. Game Changer is on 19 state lists, a YALSA Top Ten pick, and a Junior Library Guild Premier selection. Rivals was also a Junior Library Guild selection, and a YALSA Quick Pick for Reluctant Young Adult Readers. Greenwald is also the author of the Crimebiters! series and the Charlie Joe Jackson series, among many other books for children. Day job–wise, Greenwald is the cofounder of Spotco Advertising, a theatrical and entertainment advertising agency in New York City, and the lyricist and co-bookwriter (with Andrew Lippa) of John & Jen, an off-Broadway musical that has been produced around the country and internationally. Lesley Vamos earned a bachelor of digital media with high distinction from the University of New South Wales Art and Design, along with an honorary award in hand-drawn animation despite continuing to hold her pencil incorrectly. Vamos has been running her illustration and design business for over a decade and is passionate about telling stories that put good into the world. She is the illustrator of If Dinosaurs Had Hair, Disgusting Justin, and the Good Sports League series. She lives in Sydney with her partner, two children, and a small floofer named Penny.