William Bruce Cameron (born 1960) is an American author, columnist, and humorist. Cameron is most famous for his novel A Dog's Purpose, which spent 19 weeks on the New York Times bestseller list. The book is the basis for the movie version starring Dennis Quaid, Britt Robertson, Peggy Lipton, K.J. Apa, Juliet Rylance, Luke Kirby, John Ortiz, and Pooch Hall, and released in theaters on January 27, 2017. A Dog's Purpose is followed by a sequel called A Dog's Journey, which Cameron, along with Cathryn Michon, adapted into a film of the same name due to be released in May 2019.