Sarah Crossan is the author of One, which won the Carnegie Medal and the Bookseller's prize for young adult fiction and was named the Irish Children's Book of the Year. It was also named to the White Ravens list, was an Indie Next selection, and earned four starred reviews in the US. In 2018, Sarah Crossan was named Irish Children's Laureate. Two other novels, The Weight of Water and Apple and Rain, were also shortlisted for the Carnegie Medal. Sarah Crossan has lived in Dublin, London, and New York, and now lives in Sussex. She graduated with a degree in philosophy and literature before training as an English and drama teacher at Cambridge University. Since completing a master's in creative writing, she has been working to promote creative writing in schools.