From Wikipedia, the free encyclopedia. Sven Bert Jonas Karlsson (born 11 March 1971) is an Swedish actor and author. Karlsson was born in Södertälje. He won a Guldbagge-Award for Best Actor in 2004 for the movie Details. He published his first book, a collection of short stories, in 2007. Description above from the Wikipedia article Jonas Karlsson, licensed under CC-BY-SA, full list of contributors on Wikipedia.