He was a clerk for the district stipendiary magistrate until 1811.

His father had migrated from Denmark to work as a district stipendiary magistrate.

From 1869 to 1889 he served as district stipendiary magistrate (sorenskriver).

After the war he was a civil servant and judge, serving as district stipendiary magistrate between 1946 and 1973.

In addition to the district stipendiary magistrate, only one deputy judge works there.

He reached as high as being acting district stipendiary magistrate.

Nils Landmark retired from the position as district stipendiary magistrate in 1852.

From 1977 to 2001 he was the district stipendiary magistrate in Inderøy.

Finally, from 1921 to 1934 he worked as district stipendiary magistrate (sorenskriver) of Karmsund.

He was also acting district stipendiary magistrate of Romsdal for one and a half year.