Marthe Jocelyn is an award-winning author and illustrator who worked for many years as a toy designer before turning her hand to writing. Her picture book, Hannah’s Collections, was shortlisted for a Governor General’s Literary Award for illustration. She has written five novels for older readers and five picture books. Tom Slaughter’s art has been exhibited in the United States, Canada, Europe, and Japan. His prints are in the collections of the Museum of Modern Art and the Whitney Museum. His children’s books include 1 2 3: A Counting Book, and One Some Many, which was his first collaboration with Marthe Jocelyn. Marthe Jocelyn and Tom Slaughter are married and divide their time between Stratford, Ontario and New York City. They have two daughters. Over Under is their second collaboration.