Kammala jumla mai zuwa: Daga aikin wasan kwaikwayonsa mai yawa, rawar da ya taka a matsayin "Mackie Messer" ("Mack the Knife") a farkon duniya na Bertolt Brecht's "The Threepenny Opera" yana da mahimmanci. Wannan wasan kwaikwayon ya faru a ranar 31 ga Agusta 1928 a Theater am Schiffbauerdamm. A wannan lokacin, ana ɗaukar Paulsen a matsayin mai sha'awar Brecht. A cikin 1938 Harald Paulsen ya zama darektan Theater am Nollendorfplatz a Berlin, inda galibi ake yin wasan kwaikwayo a wancan lokacin. Ya kuma jagoranci da yin wasan kwaikwayo a matsayin mawaƙa. An tilasta masa yin murabus daga mukaminsa a 1945, bayan da
Ƙarshen yakin duniya na biyu a Turai. Paulsen kuma ya bayyana a matsayin dan wasan kwaikwayo a fina-finai fiye da ashirin. Ya ci gaba da aikinsa na wasan kwaikwayo a cikin zamanin fim mai sauti kuma ya bayyana a cikin fina-finai kusan casa'in.