Michael Rosen is a poet and the author of many books for children, including the international bestseller We're Going on a Bear Hunt, illustrated by Helen Oxenbury, which won the Nestlé Smarties Children's Book Prize; A Great Big Cuddle, illustrated by Chris Riddell; and Michael Rosen's Sad Book, illustrated by Quentin Blake. He received the Eleanor Farjeon Award for services to children's literature in 1997 and served as Children's Laureate in the UK between 2007 and 2009. Michael Rosen lives in London.

Helen Oxenbury is a two-time winner of the Kate Greenaway Medal and the 2015 Carle Artist Honoree. She is a celebrated illustrator of many well-loved books, including Charley's First Night and When Charley Met Grampa, both by Amy Hest, Farmer Duck by Martin Waddell, We're Going on a Bear Hunt by Michael Rosen, and There's Going to Be a Baby by her husband, John Burningham. Helen Oxenbury lives in London.