Robert Sean Leonard is an American actor best known for his roles in film, television, and theater. He gained fame for his portrayal of Neil Perry in the movie Dead Poets Society, which was released in 1989. Leonard has also appeared in popular TV series such as House, where he played Dr. James Wilson, a close friend of the main character, Dr. Gregory House. In addition to his screen work, Leonard has a strong background in theater. He has performed on Broadway in productions like Long Day's Journey Into Night and The Invention of Love. His versatile acting skills have earned him critical acclaim and a dedicated fan base throughout his career.