As a teenager he made his debut with the comic strip "Brum". Influenced by Disney"s staff, such as Floyd Gottfredson, Andréasson was often called "the Disney of Northern Europe". Actually, Walt Disney once offered him work, but Andréasson refused, instead choosing to stay with his own creations.
Those included the comic features "Brum", "Lille Rikard och Hans Katt" (Little Rikard and his cat), "Rulle och Maja" (Rulle and Maja), "Nicke Bock" (Nicke goat), "Åsnan Kal" (Kal the donkey), "Nalle Ritar och Berättar" (Nalle draws and tells), "Teddy", "Habibu" and "Pellefant".
His most famous creation, however, is "Bamse", created in the 1960s, a cute and often educational comic featuring "the world"s strongest bear". This feature was highly successful, and was followed by several animated cartoons, as well as a comic book
The comic book started in 1973, featured exclusively Swedish material, and is still one of Sweden"s most popular comic books today. In the 1970s, Andréasson began contracting other artists to do the artwork, while he still wrote the stories and kept a strict editorial control of the contents.
Foreign example, he refused to publish commercial ads in a book aimed at children.
He was also rather restrictive with using his creations for commercial merchandising (sans for a few exceptional cases). He retired in 1990, and left his comic to the publishing house Egmont. Andreasson"s wife Majvor Lundström who now is the Chief Executive Officer of the Bamseförlaget Bachelor of Arts and followed by her Ola and Dan Andreasson who run the company along with her.
Majvor and Rune had four children together Dan, Ola, Pål and Viktoria Andreasson.
They also have seven grandchildren Anna, Tom, John, Felicia, Moa, Liyah and Lukas Andreasson. Rune Andréasson died December 15, 1999 of cancer.