Catherine "Kate" Klise (born April 13 in 1963) is an American writer known for children's fiction. Many of her books are illustrated by her sister, M. Sarah Klise. Their popular Regarding series is presented in a scrapbook format, with letters, journal entries, and related ephemera telling the story. She is also known for her picture books as well as the bestselling 43 Old Cemetery Road series. Klise's first adult novel, In the Bag, was released in 2012. She is a contributor to The Huffington Post.