Adam Kay (Author) Adam Kay is a former doctor who has written three million books and sold five copies. No, hang on - he's written five books and sold three million copies. His first book, This is Going to Hurt- Secret Diaries of a Junior Doctor, was number-one for over a year and his first children's book, Kay's Anatomy, became the fastest- selling children's general non-fiction hardback of the decade. Henry Paker (Illustrator) Henry Paker was once a little boy who did silly doodles in the margins of books. Now he is a grown man who does silly doodles in the middle of books. He is an award-winning comedian, writer and illustrator. He co-writes and performs in the Radio 4 sitcom ReincarNathan and co-hosts the Three Bean Salad podcast. Henry has illustrated all of Adam's children's books.