Klaus Hagerup (born 5 March 1946). He is a Norwegian author, translator, screenwriter, actor and director. He is the youngest of two brothers. He debuted with the poem collection "Slik tenker jeg på dere" ("This is how I think about you") in 1969. During 1968–69 he worked at the Bergen theatre Den Nationale Scene and later at Nationaltheatret and Hålogaland Teater as an actor, instructor, director and writer. He has also acted in several movies, but is best known as a writer of plays for scene and radio theater. He has also written many well-known books, mostly for teenagers, but also for older and younger readers.He is best known for his books about the insecure teenage boy Markus. In 1988 he wrote a biography "Alt er så nær meg" ("Everything is so close to me") about his famous mother, Inger Hagerup. He has won several literature awards for his books, including the Brage Prize in 1994. Sverre Kjelsberg has written music for many of his lyrics, amongst others "Ellinors vise" ("Ellinors song"). He has also collaborated with people like Tande-P, Jostein Gaarder, and Trond Kirkvaag. His brother, Helge Hagerup(deceased) was an author and artist, and his daughters, Hanne Hagerup and Hilde Hagerup, are also authors.