Background
He was born at Tveter farm in Asker as a son of Bent Holtsmark and his wife Anne Elisabeth Gabrielsen.
He was born at Tveter farm in Asker as a son of Bent Holtsmark and his wife Anne Elisabeth Gabrielsen.
He attended a private agricultural school at Østensjø from 1876 to 1878, the Higher College of Agriculture at Aas from 1883 to 1884 and the Landwirtschaftliche Hochschule Berlin (Agricultural University of Berlin) from 1885 to 1886.
He was also known for establishing the agricultural college at Sem in his native Asker. They ran the college until 1914. In 1893 he took over the farm Tveter, and was a farmer there.
His book Husdyrlære, a textbook on livestock, came in 1897 and was reprinted fourteen times, last in 1961.
Also, he contributed to the newspapers and magazines Budstikken, Dagbladet, Verdens Gang, Tidens Tegn and Allers with writings on agriculture. He was elected to the Parliament of Norway from the constituency Akershus Amt in 1903, and was re-elected in 1906.
He first represented the Conservative Party, and in the second term he was registered for the Coalition Party. On 1 March 1910, he was appointed as the new Minister of Agriculture in the cabinet Konow, succeeding Wollert Konow (Bachelor of Science) in the position.
He held office until the cabinet fell in February 1912.
He was later re-elected in 1915 and 1918 to serve a further two parliamentary terms, this time for the Liberal Left Party. He was a chairman of the Liberal Left Party for a period. He received honorary membership in the two latter organizations.
Conservative Party, Liberal Left Party.
He was a four-term member of the Parliament of Norway, and served as Minister of Agriculture from 1910 to 1912. He was also a chairman of the Norwegian Fire Protection Association, and a member of the board of Norsk Husflidsforening, Norsk Landmandsforbund, the Royal Norwegian Society of Development from 1898 to 1907 and 1919 to 1931, and Havedyrkningens Venner from 1916 to 1935. From 1927 to 1936 he worked as director and chair of Norges Hypotekbank, and he was also a member of several public boards, agencies and committees.