Penny Worms and Graham Rich are the creative team behind a number of activity and educational books. They have been in children s book publishing for over 20 years Penny as a children s book editor and writer whose book credits include The Gruffalo Child s Sticker Activity Book (Macmillan), My First Creativity Book: Dinosaurs (Carlton), and a number of books for the ever-popular Wallace & Gromit. Graham is a versatile graphic designer and illustrator, who enjoys creating funny cartoon characters as much as designing exciting children s books. Pirate Blacktooth in Arcturus s Adding and Subtracting Puzzle & Activity Book is his alter-ego, although Graham does still have all his teeth and legs."