Among his main characters were the master detective "Blomkvist" in adaptations of Astrid Lindgren's children's books (the Bill Bergson series).
In 1973 he made the film Kanarifuglen, and in 1974 the thriller Bortreist på ubestemt tid, based on a crime novel by Sigrun Krokvik.
His last film was the political drama Kronprinsen from 1979, based on a true story, with Bjørn Sundquist making his debut in the leading role.
[2] Despite his success as a filmmaker Bang-Hansen has for several generations been best known throughout Norway as one of the nation's leading film critics, while working in that capacity for the Norwegian Broadcasting Corporation (NRK) for forty years, from 1967 to 2007.
[4] Among his posthumous works is a film script about an undercover resistance group from World War II, a branch of the clandestine organization XU.
[3] Shortly before his death, in March 2010, he was awarded the order Den Hvide Knap from the Norwegian Students' Society's theatre Teater Neuf in Oslo.