This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) This article is missing information about Early life, more Career, Personal life, Achievements and honours. Please expand the article to include this information. Further details may exist on the talk page. (June 2023) .mw-parser-output .hidden-begin{box-sizing:border-box;width:100%;padding:5px;border:none;font-size:95%}.mw-parser-output .hidden-title{font-weight:bold;line-height:1.6;text-align:left}.mw-parser-output .hidden-content{text-align:left}You can help expand this article with text translated from the corresponding article in Norwegian. (August 2021) Click [show] for important translation instructions. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Norwegian Wikipedia article at [[:no:Sigmund Hagen]]; see its history for attribution. You should also add the template ((Translated|no|Sigmund Hagen)) to the talk page. For more guidance, see Wikipedia:Translation. (Learn how and when to remove this template message)