Fantasy writer who helped pen the Warriors book series, as well as the Seekers series and stand-alone novels such as Exiled from Camelot (2000) and The Reliquary Ring (2002). Many of her books are written under the pen name of Erin Hunter.
She worked as a teacher after graduating from Manchester University and St. Anne's College, Oxford. She published one of her first novels, The Book and the Phoenix (part of the Saga of the Six Worlds series), in 1989.
She wrote several books in both the Eaglesmouth Trilogy and the Abbey Series.
She grew up in Lancaster, England. She later had two sons, Will and Adam, with ex-husband Peter Baldry.
She co-authored the Warriors book series with fellow writer, Katy Cary .