Breitenfeld joined the ensemble of the Mannheim National Theatre after World War II, where he participated in a staging of Tell auf der Achterbahn, the first production after the theater was reopened.
He received roles in Basel and Zürich, where he acted alongside director Friedrich Dürrenmatt in an adaption of his play The Visit, as well as Mannheim, again, and Dortmund.
(1953), Schweik in the Second World War and Rainer Erler‘s A Guru Comes, in mini-series, for instance Der seidene Schuh and TV series Die Firma Hesselbach.
As a voice actor Breitenfeld became known to a large audience as "Hoss Cartwright“ (Dan Blocker) in Bonanza, who he dubbed in the Hamburg versions, along with Michael Chevalier, Martin Hirthe and Thomas Braut, and in Blocker's appearances in Margret Dünser’s V.I.P.-Schaukel and the detective film Lady in Cement.
Additionally, Breitenfeld participated in several audio dramas and radio productions, including The Grass Harp, NWDR 1952, based on Truman Capote’s novel, and as the „Luckdragon Falkor“ in the adaptation of Michael Endes Neverending Story“, KIOSK 1984.