Sigurd Willoch took the mag.art. degree in 1925 from the University of Kristiania. He worked as a research fellow from 1928 to 1933, taking the doctorate in 1932. He was the art critic for the newspapers Aftenposten from 1935 to 1942 and Morgenbladet 1945–46.
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He wrote considerably about Norwegian art and artists dating from the 19th century, including works about artists Olaf Isaachsen, Edvard Munch, Hugo Lous Mohr (1889–1970), August Cappelen (1827–1852) and Thomas Fearnley (1802–1842). He also produced works which focused on the Art Society in Oslo and the National Gallery of Norway.[2]
He was employed as a curator at Akershus Castle in 1937 and held this position until he took over as director of the National Gallery of Norway in 1946. He was the director of the National Gallery from 1946 to 1973.
He served on the National Gallery Board 1952–76, was a member and sometimes chairman of the Norwegian unit of Scandinavian Museum Association 1946–71, Norwegian member of the Comité International d'Histoire de l'Art (CIHA) from 1958 to 1973 and represented Norway for some years in the International Council of Museums.
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