Košir studied at the School of Natural Science and Mathematics in Ljubljana (sl), graduating with a degree in mathematics and physics in 1969, initially with the intention of becoming a teacher of mathematics.[1] When she was a first-year undergraduate student in 1967, she made her film debut in Breza (The Birch Tree).[1] She then starred in the TV drama Pravljica na podstrešju (Fairy Tale in the Attic).[2] She ultimately appeared in about 30 films, largely throughout the 1960s and 1970s, including Real Pests, Sreča na vrvici (sl, Happiness on a Leash), and Ko pride lev (sl, When the lion comes).[2]
In 1975, Košir obtained a degree in journalism from the School of Sociology, Political Science and Journalism in Ljubljana (sl). In 1979 she obtained a master's degree in sociology, and in 1987 she graduated with a doctorate in philology from The Faculty of Humanities and Social Sciences at the University of Zagreb.[3]
From 1970 to 1973, Košir published regularly in the Slovenian current affairs magazine Mladina.[3] She continued to work as a journalist with the Tedenska tribuna and Teleks, and wrote for many other Yugoslav newspapers.[3] She was also a member of the editorial board of Nova revija magazine from 1982 to 2000.[3]
In 1993, she became a professor of journalism in the Faculty of Social Sciences of the University of Ljubljana.[4] She was the chair of the journalism department there for several years.[4] In addition to her journalistic pieces and academic articles, she wrote substantial popular science works and was an author of more than a dozen books, including several textbooks.[4] She was credited with being one of the earliest scholars of journalism in Slovenia.[4]
On 1 October 2011, she became the president of the Movement for Sustainable Development of Slovenia,[5] which she had co-created with the sociologist Matjaž Hanžek (sl).[6]
Košir died on 2 May 2024, at the age of 76.[7]
