Sebastian Arcelus is an American actor. He only recently started acting professionally on the screen in the 2010s. He made his television debut in an episode of Person of Interest. Following this, he made his feature film debut in The Last Day of August. His breakout role was as Lucas Goodwin in the acclaimed Netflix series House of Cards. He went on to star in the miniseries It Could Be Worse. He also appeared in two episodes of The Leftovers. In 2014, he appeared as Frank in the romantic-drama film The Best of Me. That same year, he started playing the role of Jay Whitman in Madam Secretary, gaining him wider recognition.