Kari Sønsthagen, born in 1946, is a master in children's literature and and has since 2005 been head of the school for writers of children's literature at Denmark's Pedagogical University. She wrote non-fiction books about children's literature, several works together with Torben Weinreich, among others "Værker i børnelitteraturen" (2008).

Kari Sønsthagen and Torben Weinreich have translated a large number of books into Danish, in particular from Norwegian, among others the majority of the Dag Solstad's writings, and a wide range of children's books.