Stephen L Sullivan, or "Sully", is an actor based in Los Angeles, CA. He is known for portraying the iconic "John Lennon" in the HBO's series, "Vinyl", in episode 8, "E.A.B.". Stephen is also well known for his role as "Clay" in AMC's "Mad Men" for his encounter with Roger Sterling at the hippie commune in the episode entitled, "The Monolith". He was seen as "Dennis Wilson", on Lifetime's, "Manson's Lost Girls" and as a church missionary in season 2 of "Criminal Minds:Beyond Borders". He has been found on the short end of a rope as cattle wrangler, "Cooper James" in "Longmire". As the fratricidal "Liam Finnegan" of the Channel Street Boys in "Rizzoli & Isles". And as the itchy trigger fingered "Sean Rourke" in the short lived series, "Ironside". He was also the renowned "Serge" on the long running "General Hospital".