Mark Arnott (born June 15, 1950) is an American actor and martial artist. He is best known for his recurring role as Mark on the NBC television show Cheers, and as Jeff Andrews in Return of the Secaucus 7, John Sayles' debut film as a director. He did thirty years of other TV shows, playing in Joan of Arcadia, The Bernie Mac Show, NYPD Blue, soap operas, Mickey Spillane's Mike Hammer and other movies of the week.