From 1945-1949, Oestreich was "Hauptschulrat" in Berlin-Zehlendorf, from 1949 to 1950 in the "Hauptschulamt" of the Magistrat of Groß-Berlin Dezernent for higher education.
Oestreich was "Hauptschulrat" in Berlin-Zehlendorf-Berlin Dezernent for higher education. This was from 1949 to 1950 in the "Hauptschulamt" of the Magistrat of Groß. This was from 1945-1949.