[1] He was married to actress Karin Swanstrom and ran SF Studios for over a decade.

[4] In his book Scandinavian Film, Forsyth Hardy writes of this period of the studio's history that "Svensk Filmindustri, through its producers Karin Swanstrom and Stellan Claesson, was content to produce modestly conceived films for the home market.

They were for the most part comedies with a strong theatrical flavour or farces, some of them originating strangely in the novels of P. G.

"[5] During his time there, Claësson was nicknamed by some colleagues "Råsunda's dictator" for his autocratic manner.

[7][8] Stellan Claësson was first married to the actress Karin Swanström (1873-1942), from 1915 until her death; they managed SF Studios together and were sometimes called the "King and Queen in Filmstaden".