He has also been of great importance in shaping the Supreme Court's role in the Danish-Norwegian history in the early 19th century.
From August 1786, Colbjørnsen was secretary of the Rural Commission (Landbokommisjonen), a Danish committee appointed by then-Crown Prince Frederik, Regent of Denmark.
The purpose of the Commission was to develop proposals for improvements in agriculture and set up clear guidelines for the relationship between landlords and peasants farmers.
From 1804 until his death, Christian Colbjørnsen served as Chief Justice for the Supreme Court (Da.
Colbjørnsen was an energetic and authoritative leader of the Supreme Court who was an avid supporter of an enlightened autocracy.