He attended Kristiania Latin School and enrolled at the University of Copenhagen in 1718 where he graduated in theology in 1720 before studying law.

He was appointed as Supreme Court justice in 1747 and was in 1747–49 and again in 1753–57 also a member of the economy and commerce college.

He worked on a revision of Danish law from 1737, initially alone and later as part of a commission, but with meagre results.

[2] He was for a while the owner of the estate Petersborg at Høsterkøb where he established a plantation of mulberry trees before selling it in 1752.

Munthe married Anna Dorothea Smith (10 September 1713 – 18 February 1777), a daughter of Fiscal-General Troels Smith (1672–1730) and Ellen Kaasbøll (1682–1748), on 25 May 1730 in the Church of Our Lady in Copenhagen.