Kjartan Poskitt When Kjartan was young he used to play pianos, present tv science shows and invent puzzles. After that he wrote the Murderous Maths books along with lots of other books about magic, space and pants. Then when he got old, a girl called Agatha Parrot asked him to help write down stories about her life. Agatha says: 'So far I've written out most of the words in my spelling book. I've also filled about 12 numeracy books, 9 literacy books and once did a project about how the sun makes plants grow which Miss Barking gave me a gold star for. This book took me AGES though! Well I didn't exactly write it, I just talked and the old man typed it out, but it took almost the whole afternoon. It would have been quicker if he hadn't kept stopping to check if he'd got any emails, but he never had. (What a loser!)' David Tazzyman David Tazzyman is now one of the most popular illustrators in children's books. He is perhaps most famous for his work on the Agatha Parrot and Mr Gum series, for which he has won awards such as The Roald Dahl Funny Prize and the Blue Peter Book Award. David lives in South London with his girlfriend, Melanie, and their son, Stanley. He grew up in Leicester, studied illustration at Manchester Metropolitan University and then travelled around Asia for three years before moving to London in 1997. He likes football, cricket, biscuits, music and drawing. He still dislikes celery.