[1][8][9] On June 8, 1917 Ehrmann was elected as a Slavonski Brod city councilman, a duty he performed until 1919.

[12] In 1923 he encouraged and initiated the establishment of the "Wagon, machinery and bridge factory company" in Slavonski Brod (now "Đuro Đaković d.d.")

Ehrmann and his family were known philanthropists who aided the poor and needy, city of Zagreb, various Catholic and Jewish organizations, Red Cross Croatia and others.

[19][20] On May 16, 1926 Ehrmann bought a castle, from Ljudevit Erdödy, in Jastrebarsko with the whole estate and hunting ground for the amount of 2.5 million dinars.

Ehrmann had invested a large sum of funds on the castle reconstruction, which was in poor condition.

[7][21][22] During World War II, with the Independent State of Croatia regime in power, Ehrmann and his family were required to submit mandatory application of wealth to the office for the Jews at Ministry of Public economy.

[17][18] Ehrmann helped Jews escape the Independent State of Croatia, by issuing them visas for Portugal.

[2][17] His son Leon was jailed in Nazi Germany as an officer of the Kingdom of Yugoslavia army, and his daughter Ada escaped to Split with her husband Julius Weinreb, which was under Fascist Italy occupation.

[7][24] After the war, although anti-fascist, Ehrmann was a class enemy of the newly established SFR Yugoslavia.