Robert Lawrence Leonard, better known by his stage name Robert Sean Leonard, is an American actor. Leonard won a Tony Award for Best Featured Actor in a Play for his performance in The Invention of Love in 2001. He was also nominated for his leading role in Candida in 1993 and for his work opposite Philip Seymour Hoffman in Long Day's Journey Into Night in 2003. Leonard's other Broadway credits include Breaking the Code, The Speed of Darkness, Philadelphia, Here I Come!, Arcadia, The Music Man, Born Yesterday and To Kill a Mockingbird. Leonard is known for his performance as Neil Perry in Academy Award-winning film Dead Poets Society and for playing Dr. James Wilson in the television series House, M.D.. He currently appears in a recurring role as Dr. Roger Kadar on the television series Falling Skies.