His first Hollywood contract was with Lippert in 1949.
Younger brother of screenwriter Lewis Meltzer.
Appeared in flashbacks as Estelle Getty's late husband on episodes of The Golden Girls (1985).
Provided long-standing comic relief for Danny Thomas on his classic TV show as Charlie Halper, owner of the Copa Club where Danny performed. Eventually Pat Carroll was added to the cast playing Halper's wife Bunny. Frequently kidding with the press, he told reporters he got the part of Charlie because Sid was the only person Thomas could find that was homelier than he was.
His father, Isidore Meltzer, was a comedic actor in vaudeville and the Yiddish theater.