Samuel Barnett is an English actor. In the early 2000s, he got his start in the acting industry. He debuted as an extra in the television show Coupling. His first credited role was in an episode of The Inspector Lynley Mysteries. At the same time, he played Doddington on the BBC series Strange. In 2005, he made his big screen debut in the film Mrs Henderson Presents, followed by the movie The History Boys. He later played the title role on the documentary Wilfred Owen: A Remembrance Tale. He later portrayed Thomas Boylston Adams on the HBO miniseries John Adams. He gained significant attention for starring as Joseph Severn in the movie Bright Star. He became further known for playing the lead in the show Dirk Gently’s Holistic Detective Agency.