|Gunnerius Ingvald Isachsen|
Isachsen in 1921
3 October 1868|
|Died||19 December 1939
|Other work||Polar scientist;
First president of the Norwegian Maritime Museum
He was born in Drøbak, Norway in 1868 and grew up there. His father was the shipmaster Nils Høgh Isachsen (1838–1913), and his mother was Marie Cecilie Sivertsen (1839–1909). His sister, Louise Isachsen, was a physician.
After passing the matriculation exam in 1888, he entered the Norwegian Military Academy.
Isachsen was made a first lieutenant in the Norwegian cavalry in 1891. Gymnastics and sports keenly interested Isachsen, and he graduated from the gymnasium Central School in 1898, also taking courses at the Marine Observatory in Wilhelmshaven and the marine research in Bergen.
From 1898 to 1902, Isachsen was topographer on Otto Sverdrup's Fram expedition to the Arctic archipelago. During this voyage, he was promoted to Rittmeister in 1899, and mapped large areas of hitherto unknown islands in Northern Canada, mainly by long sledge journeys. These included Ellef Ringnes Island, King Christian Island.
From 1903 to 1905, he participated in the French military service in Algeria and Paris. From 1906 to 1910, he led topographic and bathymetric research expeditions at Svalbard. These expeditions were paid for by Prince Albert of Monaco.
Isachsen led his own government-financed expeditions to Spitsbergen in 1909 and 1910. As a result of these expeditions, he founded the Norwegian systematic research work on Svalbard. In 1911, Isachsen was on assignment in Russia and Japan. Three years later, a fire destroyed his house in Asker, and with it all his maps and records and maps. He served as a regular salaried officer to 1917. He was the Norwegian government's technical delegate to the Svalbard Treaty of Paris in 1914 and the Paris Peace Conference in 1919.
Isachsen visited the Faroe Islands and Iceland in 1922. In 1923, he became the Director of the Norwegian Maritime Museum in Oslo, and in 1923 and 1924, he took part in expeditions to East Greenland . He was promoted to Major in 1924, and participated in a special whaling mission to the Ross Sea in 1926-27. He was the government's whaling inspector in the Southern Ocean in 1929-30, and the leader of the fourth Norvegia expedition circumnavigating the South Pole in 1930-31.
Isachsen married Signe Amalie Eide (1876–1911) in 1903. Signehamna harbour in Svalbard is named in her honour. They had three children (Fridtjov, Nils, and Gerd). His second marriage, in 1916, was to Marie Sophie Louisa Steenstrup (1884–1958). They had five children (Kjell, Inger, Karen, Odd, and Finn); Odd Isachsen is still living. Through his second marriage, Gunnar Isachsen was a brother-in-law of Hjalmar Steenstrup.
In 1903, he was knighted 1st Class of the Order of St. Olav, and was commander of the Cross 2nd Class in 1931. He held the King's Medal of Merit in gold (1912), as well as a number of foreign orders and medals.
- Isachsen, Nunavut, Canada, a now abandoned remote Arctic research station on the western shore of Ellef Ringnes Island in the Sverdrup Islands, was named in his honour in April 1948.
- He was depicted on a Norwegian postage stamp in 2006 on the occasion of the 100th anniversary of the exploration of Svalbard.
- Isachsen Mountain, south-east of Mount Bergersen in the Sør Rondane Mountains, is named for Maj. Gunnar Isachsen, who was the leader with Captain Hjalmar Riiser-Larsen of the Norwegian expedition to this area in 1930-31.
- The plateau glacier Isachsenfonna on Spitsbergen, Svalbard, a glacier he traversed in 1906, is named after him.
- 1931, Charles P. Daly Medal
- Isachsen, G. (1907). Astronomical and geodetical observations. Report of the second Norwegian Arctic expedition in the 'Fram', no. 5 = vol. 2. Kristiania: A.W. Brøgger.
- Isachsen, G. (1913). Exploration du Nord-Ouest du Spitsberg entreprise sous les ausp. de S.A.C. le Prince de Monaco par la mission Isachsen 2 Description du champ dóperation. Monaco: Impr. de Monaco.
- Barr, Susan. "Gunnar Isachsen". Norsk biografisk leksikon (in Norwegian). Retrieved 2009-11-12.
- "Recent Norwegian Scientific Exploration in the Interior". Scientific American monthly (Scientific American Pub. Co.) 1 (Digitized Jun 3, 2009): 234. March 1920.
- Mills, William James (2003). Exploring polar frontiers: a historical encyclopedia 2. ABC-CLIO. p. 209. ISBN 1-57607-422-6.
- Harland, Walter Brian; Lester M. Anderson; Daoud Manasrah; Nicholas J. Butterfield (1997). Walter Brian Harland, ed. The geology of Svalbard. Geological Society. p. 16. ISBN 1-897799-93-4.
- Johansen, Bjørn Fossli; Jørn Henriksen; Øystein Overrein; Kristin Prestvold. "Signehamna [79° 16.4' N 11° 33' E]". Norwegian Polar Institute. Retrieved 2009-11-12.
- "100 years of systematic Norwegian research in Svalbard". ssf.npolar.no (Svalbard Science Forum). 9 June 2006. Retrieved 2009-11-12.
- Døving, Inger. "Hjalmar Steenstrup". In Helle, Knut. Norsk biografisk leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Retrieved 15 December 2009.
- "Isachsenfonna (Svalbard)". Norwegian Polar Institute. Retrieved 4 March 2013.
- "The Charles P. Daly". amergeog.org. p. 6. Retrieved 2009-11-15.
- Solo on Spitsbergen in 1906 and 1907 (1908)
- Ishavsfolk and trips I: The Norwegian geographical selskabs Aarbok 1916-1919 (1921) (new edition 1997)
- Norwegian fangstmænds Færder to Greenland (1922) (offprint of geographic selskabs Yearbook 1919-21)
- Greenland and the Greenland Ice (1925)
- Around behind blue whale (1927)
- A ishavsskippers saga (1928)
- Thoresen, Ole R. "Gunnar Isachsen in memoriam". Norwegian Maritime Museum 1914-1939 (1940)
- Gunnar Isachsen at Norwegian Polar History
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