At the University of Zagreb"s Faculty of Philosophy, he graduated and later obtained a Doctor of Philosophy degree in 1964 with a thesis on the 1939 Cvetković–Maček Agreement.
He became professor at the same faculty in 1975. Boban died of a heart attack in Zagreb on 9 October 1994.
Croatian Academy of Sciences and Arts]
In 1986 he became full member of the Croatian Academy of Sciences and Arts and in 1991 he was made member of its presidency.