From 1889 through 1890, Johann Georg and his younger brother Maximilian studied law together in Freiburg im Breisgau.

In October 1902, he was sent on a mission to the various courts of Europe to announce the accession of his father King Georg to the throne four months earlier.

[1] The Emperor of Austria appointed him Honorary Colonel of the 11th Infantry Regiment of the Austro-Hungarian Army in 1902, and the prince visited Vienna in January 1903 to acknowledge this honour and the good relation between the families.

[citation needed] From 1902, Johann Georg resided at Schloss Weesenstein approximately 30 km from Dresden, high above Müglitztal.

In 1918, after the end of World War I and the abdication of his brother Frederick Augustus III, Johann Georg sold Schloss Weesenstein and moved his permanent residence to Freiburg im Breisgau.