When Max Reinhardt died in 1943 in the United States where he had gone as a refugee, Hilpert together with the Thimig brothers, despite the Nazi regime, organised a memorial event in the Theater in der Josefstadt.
He withdrew to the small town of Wildalpen, where the family owned a holiday home, while Hartl covered for him and reported him sick.
After the war Thimig became mayor of Wildalpen for a short time, as he was the only man in the place without a National Socialist record.
[citation needed] From 1949 he performed again on stage in Vienna, alternating among the Burgtheater (of which he became an honorary member) the Theater an der Josefstadt and the Wiener Volkstheater.
On top of that he continued to work as a film director and in 1959 took over from his sister Helene (who retired on grounds of age) the direction of the prestigious Vienna Max Reinhardt Seminar, as the School of Drama of the Akademie für Musik und darstellende Kunst had been renamed after World War II, in honour of the great Austrian director.