Anders Jacobsson (born 1963) and Sören Olsson (born 1964) are two Swedish-born cousins who are writers of children's literature and young-adult fiction. They are best known for their books about Sune and Bert, but also Tuva-Lisa and Emanuel. They have also written the scripts of several television series. The cousins have also created music together, as the act Hemliga byrån. Their most famous song is Hej, hej, hemskt mycket hej, which became a hit song in Sweden reaching Svensktoppen in 1987.