Christopher Jacob Abbott is an American actor. Abbott made his feature film debut in Martha Marcy May Marlene. Abbott's other notable films include Hello I Must Be Going and The Sleepwalker. In 2015, Abbott starred as the title character in the critically acclaimed film James White. Abbott is mostly known for his role as Charlie Dattolo in the HBO comedy-drama series Girls and for his role as Mason Tannetti in the first season of The Sinner.