Iona Rangeley has just finished studying English at Oxford. She has wanted to be a writer since her debut novel Sam and the Pig, which she wrote when she was five. Iona starting writing Einstein the Penguin when her final exams came along, because it was more fun.

David Tazzyman is an internationally acclaimed award-winning illustrator. He illustrated Andy Stanton's Mr Gum series, which went on to win numerous awards including the first Roald Dahl Funny Prize, and he has illustrated many children's picture books, including You Can't Take an Elephant on a Bus and The Truth According to Arthur.