Career
Mattsson rose to fame as a result of his book Prinsessan. The book was translated into some thirty languages, including English, it was a bestseller in Finland and was filmed as A Time in the Sun in Sweden. Mattsson was born in Helsinki.
He worked as a journalist for Hufvudstadsbladet newspaper.
Suffering from alchoholism, he committed suicide at the age of 52 in Helsinki.