Margaret Colleen Hoover (née Fennell; born December 11, 1979) is an American author who primarily writes novels in romance and young adult fiction. She is best known for her 2016 novel It Ends with Us. Many of her works were self-published before a publishing house picked them up. As of October 2022, Hoover has sold approximately 20 million books. Time magazine named her one of the 100 most influential people in the world in 2023.