Gareth Moore (Author) Dr Gareth Moore (B.Sc (Hons) M.Phil Ph.D) is the internationally bestselling author of a wide range of brain-training and puzzle books for both children and adults, including Anti-stress Puzzles, Ultimate Dot to Dot, Brain Games for Clever Kids, Lateral Logic, Extreme Mazes and The Ordnance Survey Puzzle Book. His books have sold over a million copies in the UK alone and have been published in 29 different languages. He is also the creator of online brain-training site BrainedUp.com and runs the daily puzzle site PuzzleMix.com.

Ellen Bailey (Author) Ellen grew up in Cambridge and spent her childhood making up games, putting on plays, and writing a magazine for all the children living in her street. After studying English Literature she worked as a children's book editor for a few years before moving into the charity sector. She lives with her husband and daughters, and is the author of a variety of bestselling activity books and annuals, including All About Me.