Hawking, Stephen: - Stephen Hawking was a brilliant theoretical physicist and is generally considered to have been one of the world's greatest thinkers. He held the position of Lucasian Professor of Mathematics at the University of Cambridge for thirty years and is the author of A Brief History of Time, which was an international bestseller. His other books for general readers include A Briefer History of Time, the essay collection Black Holes and Baby Universes, The Universe in a Nutshell, The Grand Design, and Black Holes: The BBC Reith Lectures, as well as the books in the George's Secret Key series. He died in 2018.

Hawking, Lucy: - Lucy Hawking, Stephen Hawking's daughter, is a journalist and novelist. She is the coauthor of the George's Secret Key series for kids, as well as the author of the adult novels Jaded and Run for Your Life. She lives in Cambridge with her son.

Parsons, Garry: - Garry Parsons is the award-winning illustrator of many books, including George's Secret Key to the Universe, George's Cosmic Treasure Hunt, George and the Big Bang, George and the Unbreakable Code, and George and the Blue Moon by Lucy and Stephen Hawking; Billy's Bucket by Kes Gray; and What's Cool About School by Kate Agnew. He lives in London. Visit him at GarryParsons.co.uk.