Martin Jenkins is the author of many groundbreaking Walker non-fiction titles, including Can We Save the Tiger? (overall winner of the SLA Information Book Award), The Emperor’s Egg (winner of The Times Junior Information Book Award) and The Story of Money.

His adaptation of Jonathan Swift's classic adventure story Gulliver’s Travels won the Kate Greenaway Medal. Martin lives in Cambridge.

Tim Hopgood is an award-winning picture book author and illustrator. His first book, Our Big Blue Sofa, was published by Macmillan in 2006 and won the Cambridgeshire Read it Again! award for best debut picture book.

In 2008 he won the Booktrust Early Years Award for Best Emerging Illustrator, with the hugely successful WOW! Said the Owl.

His books for Macmillan include A Dog Called Rod, Here Comes Frankie and his acclaimed preschool titles, TIP TAP Went the Crab, Hooray for Hoppy and Walter's Wonderful Web.