Rachel Vail is the author of numerous novels and picture books, including Justin Case: School, Drool, and Other Daily Disasters, Piggy Bunny, and Flabbersmashed About You. She lives in New York City with her husband and sons. Matthew Cordell is the Caldecott award-winning author and illustrator of Wolf in the Snow, Trouble Gum, Another Brother, hello! hello!, and Wish. He has illustrated numerous books by renowned authors including Philip Stead (Special Delivery), Rachel Vail (the Justin Case series), and Gail Carson Levine (Forgive Me, I Meant to Do It: False Apology Poems). He lives with his family in Gurnee, Illinois.