I can’t readily think of very many actors who have starred in more than one successful sitcom. I can easily think of several who failed terribly (e.g. the entire Seinfeld cast). I wouldn’t include spinoffs a la Frasier in this, as these generally star supporting characters, not the main star(s).
Granted, I recognize it’s extremely difficult for any sitcom, regardless of stars, to be successful.
The only one I can really think of is Ted Danson (Cheers, Becker). Personally I don’t really care for Becker but it stayed on the air for 6 seasons so I guess it could be considered successful.
Bob Newheart starred in The Bob Newheart Show in the 70’s and Newheart in the 80’s. Mind you, technically this is a borderline example, given Newheart’s ending.
Bill Cosby starred in both The Cosby Show in the 80’s and Cosby in the 90’s.
I think Tim Allen is earning consideration. Home Improvement was huge and, at least IMO, Last Man Standing could be another hit. I think it’s funny as all get out.
Neil Patrick Harris. Very different kinds of ‘sitcom’, but since Doogie Howser was a half-hour with comedy elements I’d include it, and I wouldn’t exactly call him a ‘Supporting Character’ on “How I met your mother.”
Dick Van Dyke – The Dick Van Dyke Show and The New Dick Van Dyke Show. The latter ran three seasons and would have run longer if it wasn’t for a censorship controversy with CBS.
Garry Shandling – It’s Gary Shangling’s Show and The Larry Sanders Show
Jeffrey Tambor – The Larry Sanders Show and Arrested Development
Good ones, all. Seems I was having a major brain freeze this morning, as I am :smack: every new post. Now I’m wondering why Ted Danson of all people was the only one I could think of.
Cosby had more than that – he has a "Cosby Show"in which he plated a gym teacher in the late 60s/early 70s, plus a variety show (not a sitcom, but definitely a comedy. He had Groucho Marx as a guest!). Not to mention the breezy I Spy.
Henry Morgan – besides MASH, he was in Third Rock from the Sun, not to mention Pete and Gladys and (not a sitcom; I don’t know what it was supposed to be) Kentucky Jones.
Plus AfterMASH, which we will try to forget.