[4] From 1974 he worked as freelance actor,[2] playing at the Thalia Theater in Hamburg and the Volksbühne in Berlin,[3] in Munich, Vienna and Zürich.

In 1977, Quadflieg had his career breakthrough in Reifezeugnis, an episode from the Tatort series, playing a teacher who has an affair with a student,[2] portrayed by Nastassja Kinski.

[3] He then had roles in many popular television series, including Der Alte, Derrick, Das Traumschiff, Siska and Ein Fall für zwei.

[2] Quadflieg later toured Germany regularly with programmes of reading the work of various poets, such as Eduard Mörike, Heinrich Heine and Erich Kästner.

[2] He was the German voice of, among others, Dean Stockwell in Paris, Texas, Robert Taylor in Broadway Melody of 1936 and The Crowd Roars.