[1] A freelancer, Breen has worked as journalist or columnist for NRK, the newspapers Dagbladet and Dagsavisen, and the women's magazine Kvinner og Klær.
Jakten på hva som feiler verdens beste helsevesen from 2011 she writes about pregnancy and birthcare.
155 grunner til å være feminist, together with Jenny Jordahl and Madeleine Schultz,[1] for which they received the award Fagbokprisen from the Ministry of Culture.
Norsk kvinnehistorie for deg som har det travelt (2016), Den store rumpefeiden (2016), Jeg trodde klitoris var en selskapsdans.
[1] In 2019 she issued the essays collection Om muser og menn, and in 2020 a book on feminism, Hvordan bli (en skandinavisk) feminist.