He is the author of the bestselling Charlie Changes Into a Chicken series (the first book of which was shortlisted for the Waterstones Children's Book Prize), Uma and the Answer to Absolutely Everything and Greta and the Ghost Hunters. With Jenny Pearson, he has also written Tuchus & Topps Investigate: The Underpants of Chaos and Tuchus & Topps Investigate: The Attack of the Robot Librarians.

Despite legal threats, he refuses to stop writing.

Sarah Horne has been an illustrator for over fifteen years, she started her career working for newspapers such as the Guardian and the Independent On Sunday and has since illustrated many funny young fiction titles.
She works traditionally with a dip pen and Indian ink, and finishes the work digitally.