Kes Gray is the bestselling author of the OI FROG AND FRIENDS series of books that has sold over 1.5 million copies and has been adapted into a theatre show. He is a multi-award-winning author with over 70 books published. He eats Ideaflakes for breakfast, spreads silliness on his toast and loves to write books that will make children laugh out loud. He has won the Sainsbury's Children's Book Award and the Laugh Out Loud Book Award and has been shortlisted for the British Book Awards. Kes is based in Essex.

Jim Field is an award-winning illustrator, character designer and animation director. He has illustrated many bestselling children's books, including Oi Frog! (written by Kes Gray) and The Lion Inside (written by Rachel Bright). Jim is also the illustrator of the Rabbit and Bear series, J.K. Rowling's The Christmas Pig and his debut author-illustrator bilingual picture book, Monsieur Roscoe on Holiday. He lives near Paris with his wife and daughter.