Dr. Gareth Moore is the best-selling author of over 250 puzzle and brain-training titles for both children and adults, including Brain Games for Clever Kids , The Ordnance Survey Kids' Adventure Book , and The BBC Puzzle Book . His books are available in over 40 countries and have sold over 5 million copies. He is also the creator of Brained Up, which offers daily sessions to help you make the most of your brain, and the puzzle site PuzzleMix.com. He is based in the UK. Ryan O'Rourke has been working as an artist and educator since graduating with his BFA from The University of Hartford in 2000. He has illustrated fifteen children's books and has written two.

Ryan has received numerous awards for his work from The International Reading Association, Children's Book Council, American Illustration, Society of Illustrators, SILA, 3x3 Magazine , and the Connecticut Art Directors Club. He lives in Connecticut.