After passing his Abitur, Berg joined the Prussian Army in 1885 and became the personal adjutant of Prince Friedrich Leopold of Prussia in 1888.

[1][2] In 1906 he became a member of the Geheimes Zivilkabinett (Secret Civil Cabinet), the Kaiser's personal office.

[3] He opposed peace negotiations to end World War I as supposed by Chancellor Max von Baden and had to resign on 11 October 1918.

The same year, he became the chairman of the German Nobility Association (Deutsche Adelsgenossenschaft) which he remained until 1932.

[5] From 1921 to 1927 Berg was the Chief Representative of the House of Hohenzollern in their negotiations over the family's personal property with the Weimar German government (Cf.