Michael Imperioli is an American actor, writer, and director. He's best known for his role as Christopher Moltisanti on The Sopranos. He's also known for his appearances as Nick Falco in Law & Order, Ray Carling in Life on Mars, and Louis Fitch in Detroit 1-8-7. He made a guest appearance as Robert Lewis in the CBS crime drama television series Blue Bloods in the Season 7 episodes, "The Greater Good" and "Guilt by Association".