Katie Woolley (Author) Katie Woolley is a creative and versatile editor and writer who has worked on children's books for all age levels, from board books, novelty books and picture books to non fiction, licensed publishing and educational books and apps. Katie has more than 10 years' publishing experience; she has written, commissioned, edited and project managed a variety of titles for some of the biggest children's publishers, such as Ladybird Books and Hachette Children's Books. Denis Cristo (Illustrator) Denis Cristo is an illustrator and web designer based in Belo Horizonte, Brazil. Most of his illustrations are digital vector art. He studied advertising, and worked for many years with an animation studio. Over the last few years he's been working as a freelance illustrator with the advertising and children's books markets.