Rachel Vail is the author of numerous novels and picture books, including Justin Case: School, Drool, and Other Daily Disasters, Justin Case: Shells, Smells, and the Horrible Flip-Flops of Doom, and Piggy Bunny. She lives in New York City with her husband and two sons.

Matthew Cordell's most recent books for Feiwel and Friends are Another Brother and Trouble Gum, which he wrote and illustrated. He lives outside of Chicago with his wife, author Julie Halpern, and their children.