Simon Holland has been writing and editing non-fiction books of all colours, shapes, subjects and sizes, for children and adults, for more than seventeen years.

His background is in medieval literature and history, but he has become passionate about the communication of science, nature and technology-related subjects.

As a writer, Simon has a penchant for anything fantastic, philosophical, puzzling, paranormal and peculiar.

Jill Calder has been working as an illustrator since 1993, blending traditional and digital image-making methods as seamlessly as possible to create her award-winning illustrations and lettering.

Besides Walker, and among many others, her clients include the Guardian, The New Yorker, the British Museum, Penguin Random House and Kellogg's. She lives in the beautiful fishing village of Cellardyke, Scotland.