Knud Maartmann Ringnes was a Norwegian businessperson.

He was born in Kristiania

Oslo

Oslo is a municipality, as well as the capital and most populous city in Norway. As a municipality , it was established on 1 January 1838. Founded around 1048 by King Harald III of Norway, the city was largely destroyed by fire in 1624. The city was moved under the reign of Denmark–Norway's King...

 as the oldest son of Ellef Ringnes

Ellef Ringnes

Ellef Ringnes was a Norwegian brewer and patron.He was born at the Ringnes farm in Krødsherad, Buskerud to farmer Anders Knudsen Ringnes and his wife Maren Amundsdatter . His father left the farm in 1855, and Ellef was employed as travelling salesman for Christiania Bryggeri at the age of 18...

 and Kaja, née Maartmann (1851–1933). He was a nephew of Amund Ringnes

Amund Ringnes (brewery owner, 1840)

Amund Ringnes was a Norwegian businessman, brewery owner and patron.He was born in Krødsherad, Buskerud to farmer Anders Knudsen Ringnes and his wife Maren Amundsdatter . He grew up at the farm Ringnes, and commenced working at Akers Mekaniske Verksted in 1860. He left Akers Mek...

 and maternal grandson of Knud Geelmuyden Fleischer Maartmann

Knud Geelmuyden Fleischer Maartmann

Knud Geelmuyden Fleischer Maartmann was a Norwegian politician.He was elected to the Parliament of Norway in 1865, representing the urban constituency of Flekkefjord. He worked as a merchant in the city...

, his namesake.

He graduated from Kristiania Technical School in 1896, and studied in England, the United States and at the University of Bonn

University of Bonn

The University of Bonn is a public research university located in Bonn, Germany. Founded in its present form in 1818, as the linear successor of earlier academic institutions, the University of Bonn is today one of the leading universities in Germany. The University of Bonn offers a large number...

 from 1898 to 1899. He was hired in Ringnes Bryggeri in 1897, a brewery founded by his father and uncle. His uncle on the maternal side, Harald Sigvart Maartmann, took over the company in 1901, but Knud Ringnes became chief executive officer in 1921.

He chaired the organization Norwegian Brewers in Oslo from 1914 to 1918 and 1924 to 1929, and nationwide from 1919 to 1921. He was a board member of Federation of Norwegian Industries

Federation of Norwegian Industries (1919–1989)

The Federation of Norwegian Industries was an employers' organisation in Norway. It existed between 1919 and 1989, and was one of the main organisations in the field. In 1989 it became a part of the Confederation of Norwegian Enterprise through a merger....

, the Norwegian Maritime Museum

Norwegian Maritime Museum

The Norwegian Maritime Museum , previously known as the Norsk Sjøfartsmuseum, founded in 1914, is located at Bygdøynesveien on the Bygdøy peninsula, on the western side of Oslo, Norway....

, Det Norske Travselskaps Landbane, Holmenkollen Turisthotel, Nora Fabrikker and Norges Handels- & Sjøfartstidende

Dagens Næringsliv

Dagens Næringsliv, commonly known as DN, is a Norwegian tabloid specializing in business reporting with a claimed daily circulation of 82,775 copies in 2008, making it the 8th largest newspaper in Norway. The editor in chief is Amund Djuve. Its name is Norwegian for "Today's Business".Originally...

. He was a supervisory council member of Folketeatret

Folketeatret

Folketeatret is a theatre in Oslo, Norway. The building has existed longer than the theatre, and been used as a movie theatre and opera house....

 (chair), Nationaltheatret

Nationaltheatret

The National Theatre in Oslo is one of Norway's largest and most prominent venues for performance of dramatic arts.The theatre had its first performance on 1 September 1899 but can trace its origins to Christiania Theatre, which was founded in 1829...

, Forsikringsaktieselskabet Norden, Norske Liv and Christiania Bank og Kreditkasse. He was a member of Oslo city council from 1916 to 1919, council member of the Norwegian Geographical Society

Norwegian Geographical Society

The Norwegian Geographical Society is a Norwegian learned society founded in 1889. Among the initiators was geologist Hans Henrik Reusch, who chaired the society from 1898 to 1903, and again from 1907 to 1909, and was also an honorary member...

, chaired the committee for the conservation of Fram

Fram

Fram is a ship that was used in expeditions of the Arctic and Antarctic regions by the Norwegian explorers Fridtjof Nansen, Otto Sverdrup, Oscar Wisting, and Roald Amundsen between 1893 and 1912...

.