Knut Hansen was born in Skien as a son of Major Sigvald Hansen and his wife Carmen Franciska Christina Kirsebom, and a younger brother of Sonja Wigert. He changed his last name to Wigert in 1935. Wigert was married to Eva Nordlie from 1942 to 1946. In January 1950 he married ship-owner Sofie Helene Huitfeldt, née Olsen. The marriage lasted until her death in September 1989. They resided in Bærum. He was a son-in-law of ship-owner Rudolf Olsen, and the family inherited large properties including the manor Dirhue at Tjøme. Wigert lost this to his step-children in an out-of-court settlement in 1993. In 1991 he married for the third time, to journalist Vera Dietrichson Burkoff. In his later life he lived at Madserud in Oslo. He died in June 2006 in Oslo.
Career
Actor
Wigert finished school when graduating Oslo Commerce School in 1936. He made his stage début at Centralteatret in 1937, and started acting for the National Theatre in Oslo from 1938. He played "the pilot" in an adaptation of Karel Čapek's anti-Nazi play Matka, which had dress rehearsal on 8 April 1940 and never premièred due to the German invasion of Norway the following day. Among his roles were "Hugo" in a 1950 adaptation of Jean-Paul Sartre's Dirty Hands, and "Brick" in a 1956 adaptation of Tennessee Williams's Cat on a Hot Tin Roof. He played a long series of Ibsen characters, such as "Hertug Skule", "Peer", "Rosmer", "Brack", "Helmer" , "Rubek", "Solness", "Borkman" and "Julian". A bust of Wigert, sculptured by Joseph Grimeland, was unveiled at the National Theatre in 1998. He made his film début in 1940, in the film Tante Pose, acted in the 1946 filmEnglandsfarere, and played the role "Fridtjof Nansen" in Bare et liv'' from 1968.
Wigert chaired the Riksmål Society from 1974 to 1983. He was also a supervisory council member of the National Theatre and board member of the companies Tinfos Papirfabrik and Olsen Daughter. He was decorated as a Commander of the Royal Norwegian Order of St. Olav in 1988 for his contributions to Norwegian theatre. He received the city of Oslo's cultural prize in 1992 for his initiative and efforts which resulted in the establishment of a Henrik Ibsen museum in Oslo. He received the Fritt Ord Honorary Award in 1996.