Giles Sparrow is a freelance author and editor, specializing in popular science. He has had books about space published by several children's publishers, including Scholastic and Dorling Kindersley. Felicity Forster is and author, editor and project manager who has created over 500 illustrated books on subjects such as natural history, gardening, pets, fine art, music, transport, military history, science, health, mind/body/spirit, cooking, puzzles and craft. She has a PHD in Psychology (animal behavior) and volunteers at a cat charity.