Kirsteen has been at Usborne since 1997, coming from a background in music, education, and religious publishing. In that time, she has written and edited over 300 titles, ranging from board books and flashcards to dictionaries and encyclopedias, on themes as diverse as chess, vampires, gerbils and microscopes. Most recently she has been busy writing practice, puzzle, sticker and activity books to engage, entertain and educate children at all ages and stages.