Ackermann became contributing editor of the Weißenburger Tagblatt in 1917, and of the Telegraphen-Union in Munich.
During the Third Reich he was imprisoned in Stadelheim Prison, in the KZs Dachau, Buchenwald and Dora-Mittelbau.
After World War II he became director of the municipal intelligence service of München.
From 1948 to 1951, he was head of the "Verband der Berufsjournalisten in Bayern" (association of professional journalists in Bavaria).
[citation needed] In April 1945, he was founder and chief editor of the Münchner Stadtanzeiger.