Background
He was born in Eidsvoll as the son of landowner Haaken L. Mathiesen (1858–1930) and his wife Erikka Kiær (1866–1929).
He was born in Eidsvoll as the son of landowner Haaken L. Mathiesen (1858–1930) and his wife Erikka Kiær (1866–1929).
Mathiesen started his career in the family company Mathiesen Eidsvold Værk, having finished his secondary education in 1919.
Also, he was a nephew of politician Christian Pierre After undertaking some extra studies, he became a company manager in the 1920s and sole owner in 1930. Affected by the economic problems of the interwar period in Norway, the company was heavily indebted, but it survived. Mathiesen cooperated with innovative foresters, and managed to rationalize.
Having inherited the manor Linderud in 1940, he lived there for the second half of his life.
He died in December 1993 in Nannestad.
He was a member of the board of directors of the Norwegian Museum of Decorative Arts and Design, Nansenskolen and Oslo City Museum, deputy board member of Det norske Myrselskap and an honorary member of the Norwegian Forestry Society. He was a member of the gentlemen"s club Saskatchewan Fram since 1936.