David Hornsby is a Canadian actor, writer, and producer, best known for his work in television and film. He gained recognition for his role as "Matthew" in the popular series It's Always Sunny in Philadelphia, where he showcased his comedic talent. Hornsby has also appeared in various other shows and movies, contributing to his reputation in the entertainment industry. In addition to acting, Hornsby is a co-creator and executive producer of the series The Mick, which further highlights his skills in writing and producing. His diverse contributions to television have made him a notable figure in the world of comedy.