Career
During his career, he directed 20 films, including, Läpi usvan (1948), Tukkijoella (1951),, Putkinotko (1954) and Ryysyrannan Jooseppi (1955). Hällström was married to actress Elvi Saarnio. As a screenwriter, he used a pseudonym Viljo Hela.
During his career, he directed 20 films, including, Läpi usvan (1948), Tukkijoella (1951),, Putkinotko (1954) and Ryysyrannan Jooseppi (1955). Hällström was married to actress Elvi Saarnio. As a screenwriter, he used a pseudonym Viljo Hela.