Jacobsen was born in Oslo. He started off his career with the Labour newspaper Dagsavisen (then Arbeiderbladet). He was a journalist for Arbeiderbladet from 1967 to 1977 and editor-in-chief in presses from 1977 to 1990. He was the main editor-in-chief of Arbeiderbladet from 1991 to 1994. Later, he was the information director for the Norwegian Bar Association from 1994 to 2003.
Jacobsen died after a short illness on 25 June 2014 at Ullevål Hospital, Oslo. He was 75.
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