Wolfgang Kieling
From Muppet Wiki
Wolfgang Kieling (1924-1985) was a German actor who dubbed the voice of Bert on Sesamstrasse from 1973 until his death in 1985. As a film actor, Kieling was active in German cinema, and also appeared in a few English-language films, most notably Hitchcock's Torn Curtain (1966) as East German agent Gromek (killed by Paul Newman) and as LSD smuggler Granich in the 1971 heist comedy $, starring Warren Beatty and Goldie Hawn.
As a German-language voice actor. Kieling dubbed Frank Sinatra in seven films, Torn Curtain co-star Paul Newman in four films, Leslie Nielsen twice, and in one film apiece, Charlton Heston (in Planet of the Apes), Marlon Brando, James Coburn, and Danny Kaye.

