He began studying history in 1966 at the University of Belgrade Faculty of Philosophy and graduated in 1970.
Between 1972 and 1980, Dizdar worked as a curator at the Pounja Regional Museum in Bihać.
He conducted collections, published contributions, and organized exhibitions on the recent history of Pounja from 1878 to 1945, a micro-region in Croatia based around the Una River.
Under the Faculty of Philosophy in Zagreb in 1979, he published The Workers' Movement in Pounja 1929–1941 and gained a doctorate with his dissertation Chetnik War Crimes in Bosnia and Herzegovina from 1941 to 1945.
[1] Papers, scholarly contributions: Croatia Scientific Bibliography (CROSBI) [2]