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 Ordinance Survey Puzzle Book. His books have sold over a million copies in the UK alone and have sold in 35 different languages.

He is also the creator of online brain-training site BrainedUp.com and runs the daily puzzle site PuzzleMix.com.

Chris Dickason's irreverent sense of humour was born from years as both a mild mannered doodler and angry burger flipper. Taking inspiration as much from Henri Matisse as he does The Muppets, as well as odd bits of packaging collected from foreign supermarkets, Chris' work has been described as charming and visually striking with a sharp graphic style. His illustrations are populated with rambunctious characters that are a cleverly crafted mix of an uncomplicated line style and wonky perspectives. Chris is the illustrator of Buster Books' bestselling Clever Kids series.