A full-time author who writes novels for young people, children's books and non-fiction both for children and adults. Stefan Casta has worked as a radio and television producer in Norrköping and Malmö. He has made news and sport programmes plus a number of films about about the Swedish countryside, and has also written nature columns in a number of newspapers and magazines. He lives in the southern Swedish province of Skåne on a small farm outside Veberöd, situated between Lund and Ystad.

He has published around thirty books, some of which have been translated into English, French and German. Nature is an important theme in many of these works. He worked previously at the Swedish Authors' Fund, where he was the chairman of one of its sub committees, and in the Swedish National Council for Cultural Affairs' working group for the allocation of funding for literature for children and young people. He is currently active within the Swedish Library Service, and is also a member of the Swedish Academy of Children's Books, where he opted to sit in chair number 13.

Stefan Casta has won a number of awards and distinctions, including the 1999 August Award, the 2000 Nils Holgersson Plaque for Play Dead (Spelar död), the 2001 Silver Feather for Summer with Mary-Lou (Fallet Mary-Lou) and Rabén & Sjögren's 2002 Astrid Lindgren Prize. In 2006 the Swedish Academy presented him with the Ilona Kohrtz Award for services to literature.