Ragnerstam grew up in Södermalm and later in Vällingby. His father was interested in theatre and acted out for his children. He encouraged Ragnerstam to move on to an acting course. Ragnerstam took part in plays in primary school primary education and secondary school. After that he worked on Posten AB, before he did military service conscription. An ad about training to be an actor got him to study at Kulturama, and after that he studied at NAMA in Malmö 1981–1984. After that he was involved in the Gothenburg City Theatre. Ragnerstam has also worked with Lars Norén.
Ragnerstam is married to Carina Boberg is a cousin of [author]] Bunny Ragnerstam.
The film is exceptional on many levels by calling attention to gender inequality in high school from top to bottom ... This does not meet well with her ... Julia Sporre is the outstanding centerpiece of a brilliant youth film supported by a group of talented young actors (Happy Jankell, Hjalmar Ekström, Jacob Ericksson, Katharina Cohen, Göran Ragnerstam) ... .