Mark Sperring worked as a printer before becoming a bookseller, and later becoming a children's book author. Mark is the author of The Shape of My Heart, Snappy Birthday, Dino Mummy, Dino Baby, Dino Daddy, Four Silly Skeletons, I'll Love You Always (Bloomsbury), Captain Buckleboots on the Naughty Step (Puffin) and The Sunflower Sword (Andersen). He lives in Bristol.

David Tazzyman is the bestselling illustrator of the Mr Gum books (Egmont) which have won a multitude of awards, including the Roald Dahl Funny Prize. David grew up in Leicester and studied Illustration at Manchester Metropolitan University. The Naughty, Naughty Baddies is his third picture book for Bloomsbury, following the success of You Can't Take an Elephant on a Bus and The Truth According to Arthur. He has also illustrated the latest collection of Michael Rosen's poetry for children: Jelly Boots, Smelly Boots. He lives in Leicestershire with his partner and their three children.