Rick Walton is the author of a lot of books for kids. He has written books about bunnies, bears, pigs, dogs, dinosaurs, bullfrogs, sheep, foxes, cows, cats, alligators, mice, and rats. But this is his first book about a gorilla. He lives in Provo, Utah, with whatever people and animals happen to be visiting at the moment. Girl & Gorilla is based on his life. He is Gorilla. Joe Berger is a children's author, illustrator, and cartoonist. In 2011 he was a winner of Booktrust's Best New Illustrators Award. He also makes prize-winning animated short films and title sequences and is cocreator of the Berger & Wyse food cartoon. Joe was the official illustrator for World Book Day 2010. He lives in Bristol, England, with his wife and three daughters.