Tommy Greenwald is the author of Game Changer, Rivals, and Dinged. Game Changer is on 19 state lists, and was 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 the author of the Crimebiters! and Charlie Joe Jackson series, among many other books for children. Day job-wise, he 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.