Adam Rex is the New York Times best-selling author and illustrator of Frankenstein Makes a Sandwich. His other books include The True Meaning of Smekday, which was made into the hit animated movie Home; Moonday; and School's First Day of School, illustrated by Christian Robinson.

He also illustrated the Brixton Brothers series, Billy Twitters and His Blue Whale Problem, Chloe and the Lion, and How This Book Was Made, all by Mac Barnett, and Chu's Day, by Neil Gaiman. He lives in Tucson, Arizona.