Michael Rosen is one of the most popular authors for children. His bestselling titles published by Walker Books include We're Going on a Bear Hunt, A Great Big Cuddle, Little Rabbit Foo Foo, Michael Rosen’s Sad Book, Tiny Little Fly and What Is Poetry?.

Michael received the Eleanor Farjeon Award for distinguished services to children’s literature in 1997, and was the Children’s Laureate from 2007 to 2009. He is a distinguished critic and academic, Professor of Children's Literature at Goldsmiths, University of London.

He also presents radio programmes for the BBC, and is a political commentator. Michael lives in London.

Jill Calder has been working as an illustrator since 1993, blending traditional and digital image-making methods as seamlessly as possible to create her award-winning illustrations and lettering.

Besides Walker, and among many others, her clients include the Guardian, The New Yorker, the British Museum, Penguin Random House and Kellogg's. She lives in the beautiful fishing village of Cellardyke, Scotland.