Jan Guillou is a Swedish author and journalist born on January 17, 1944, in Södertälje, Sweden. He is well known for his investigative journalism, notably exposing a secret intelligence agency in Sweden in 1973, and for writing popular spy fiction series such as those featuring the character Carl Hamilton, as well as historical novels about the Knight Templar Arn Magnusson. Guillou holds dual French-Swedish heritage, acquiring Swedish citizenship in 1975 after being born with French citizenship due to his father's nationality. Guillou lives in a prestigious early 20th-century apartment on Östermalm in Stockholm with his wife, Ann-Marie Skarp, who is a publisher. In addition to the city residence, he owns a country home and a writer's cabin in northern Roslagen, Östhammar Municipality. His writing career spans decades with numerous books, and he is involved in media companies in Sweden. The name "Var Bor Jan Guillou" in your query breaks down to "Where does Jan Guillou live?" in Swedish, and as stated, he lives on Östermalm in Stockholm and on his property in northern Roslagen.

If you were asking specifically about the words "var," "bor," "jan," and "guillou" in another context or language learning, please let me know so I can assist accordingly.