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.

Nicola O'Byrne was born in Swaziland, grew up in Singapore and has lived in Papua New Guinea, Kenya, Edinburgh, London and Cambridge. She now lives in sunny Los Angeles with her husband, Sjoerd, and their invisible dog, Chewbacca.

In her spare time she enjoys weightlifting and baking. In 2014 her picture book Open Very Carefully won the Waterstone's Children's Book Prize, the Stockport Children's Book Prize and the Oldham's Brilliant Book Award, was highly commended for the UKLA Book Award and shortlisted for Oscar's First Book Prize and the Sheffield Children's Book Award.