Chaplin was born in Windsor, Berkshire, England, the son of Cynthia, a teacher, and Peter Greenwood CBE, a civil engineer. He has one sister, Rachel, and one brother, Justin. Chaplin became interested in acting as a teenager, after acting in a theatrical production in his school years at the Princess Margaret Royal Free School. At the age of seventeen, he enrolled at the Guildhall School of Music and Drama in London. He pursued his early acting career between odd jobs as an office worker, and for a while was employed as a statistician with the…