Matevž Košir was born in Kranj in 1964. After he completed the secondary education he continued with studies at the Faculty of Arts, his major was in history and minor in sociology of culture. He graduated in 1990. For his B.A. thesis in history he received a Faculty of Arts prize for students theses. Since that he has working at the Archives of the Republic of Slovenia (Arhiv Republike Slovenije). In 1996 he received a M.A., and in 2000 Ph.D. degree in history at the Faculty of Arts of the University of Ljubljana.