 He also made guest appearances in many well known series including "Kojak", "Hill Street Blues", "Moonlighting", "The Twilight Zone", "Remington Steele", "Dallas", in which he appeared for six episodes, "L.A. Law", "The X-Files", "Walker, Texas Ranger", "Murder, She Wrote", "Dr. Quinn, Medicine Woman", and the soap operas "Ryan's Hope" and "The Edge of Night".Coffin starred in many television films including "Under Siege", the 1989 miniseries "Lonesome Dove" and the 1995 film adaptation of "A Streetcar Named Desire".He was originally cast as the voice of the father in the series "Family Dog", he was later replaced by actor Martin Mull.