Gwyneth Rees is half Welsh and half English and grew up in Scotland. She went to Glasgow University and qualified as a doctor in 1990. She is a child and adolescent psychiatrist but has now stopped practising so that she can write full-time.
She is the author of many bestselling books, including the Fairies series, the Cosmo series and the Marietta's Magic Dress Shop series, as well as several books for older readers. She lives near London with her husband, Robert, their daughters, Eliza and Lottie, and their cat, Magnus.