Hilary McKay is a British author known for her children's and young adult literature. She has written numerous books, including the popular Casson Family series, which explores the lives of a quirky family of artists. Her writing is characterized by humor, warmth, and relatable characters. McKay has received several awards for her work, including the Carnegie Medal for her book "Saffy's Angel." Her stories often focus on themes of friendship, family, and the challenges of growing up, making her a beloved figure in children's literature.