[5] In 1969, Margolin wrote and co-produced The Ballad of Andy Crocker, an ABC television movie that was one of the first films to deal with the subject matter of Vietnam veterans "coming home".

Margolin had an uncredited role as the Station Wagon Driver in Heroes,[citation needed] another story about Vietnam veterans dealing with what we now refer to as PTSD.

Scheduling conflicts prevented him from continuing the role in the short-lived TV series of the same name that aired in 1977 as part of The NBC Sunday Mystery Movie, in which the character was played by actor Bruce Solomon.

[7] Margolin appeared in episodes of the television series M*A*S*H ("Bananas, Crackers and Nuts" and "Operation Noselift"); The Partridge Family ("Go Directly to Jail" and "A Penny for His Thoughts"); That Girl; The Mary Tyler Moore Show; Rhoda; Land of the Giants; Twelve O'Clock High; The Monkees; Love, American Style (in which he was a member of the Love American Style Players; his brother Arnold Margolin was the executive producer of the series); The Fall Guy; Magnum, P.I.

; Hill Street Blues (as bookmaker Andy Sedita in the consecutive episodes "Hacked to Pieces" and "Seoul on Ice");[8] and Touched by an Angel.

a Canadian television series as Bernie, the street-smart Private Investigator who begrudgingly helps single mom, waitress Sally Sullivan (Rosemary Dunsmore) solve crimes.

[citation needed] Margolin appeared in such feature films including Kelly's Heroes, Death Wish, Futureworld, The Big Bus, and S.O.B.

[citation needed] In addition to acting in the original and 1990s TV movie versions of The Rockford Files, Margolin also directed some episodes: "Dirty Money, Black Light" (1977), "Caledonia – It's Worth a Fortune!"

[citation needed] He was also nominated for a DGA Award for drama series direction for a 1991 episode of Northern Exposure entitled "Goodbye to All That".

[2] He was the younger brother of Emmy-winning director/producer/writer Arnold Margolin, both of them lived in Lewisburg, West Virginia,[3] and acted together there in a professional community theater production of Laughter on the 23rd Floor.

[citation needed] For 22 years, Margolin, his wife and stepchildren lived on Salt Spring Island in British Columbia, Canada.