John Richard Yancey is an American author who writes suspense, fantasy, and science fiction for young adult audiences. His works span multiple series and genres, establishing him as a prolific writer in the YA market. Among his best-known works are the Alfred Kropp series, The Monstrumologist series, and The 5th Wave series. The 5th Wave achieved particular prominence when it was adapted into a feature film in 2016, bringing his work to a wider audience beyond readers.