Greenwald, Tommy: - Tommy Greenwald is the author of Game Changer, Rivals, and Dinged. Game Changer is on 19 state lists, was a YALSA Top Ten pick, and a Junior Library Guild Premier selection. Rivals was 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 jobwise, 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.