Hildur Sif Thorarensen was born in Iceland but is currently living in Norway. Although, having completed a master's degree in Engineering, she's been writing alongside all of her studies and has among other taken a year in Creative Writing.
At the age of eight she started a neighborhood paper with her friend which was filled with short stories about the neighborhood, written by Hildur Sif. The girls sold the paper to the people living in their street and used the profits to buy candy, much to their parents chagrin. She later worked as a journalist for a newspaper in the Westman Islands as well as a translator for the city of Reykjavík and the ministry of foreign affairs.
Her first novel, Einfari, was published in Icelandic at the end of 2016 and in English in 2018 as Loner. At the end of the same year she published a thriller, His Sweet, that is set in Alabama. His Sweet is to be followed by a sequel in 2021.
After becoming a mother she's spent some time working on children's books and her first book, Búkolla, was published in English in 2021 and features beautiful pictures of the Icelandic landscape drawn by a Serbian artist.