He probably “guest-starred” in more tv-series back in the 1960s-80s than ANY other actor. Gunsmoke, Star Trek, Twilight Zone, absolutely everything. In fact, I saw him just a few weeks ago in an episode of “The FBI,” playing a commie assassin.
I remember an ‘All In The Family’ episode, (’71 or ‘72), he did as an old pal of Archie’s who made good in biz but had a poor relationship with his son. He could do just about any type of part.