He studied law at the Faculty of Law, University of Zagreb until he took part in the protest involving burning of a Flag of Hungary on the occasion of the 1895 visit by Emperor Franz Joseph to Zagreb—resulting in a prison sentence and expulsion from the university.
There he edited Hrvatska misao and Novo doba journals and graduated from the Charles University.
[1] Bertić was a member of the Croat-Serb Coalition and the elected representative of the Varaždin district in the Croatian Sabor in 1918.
In the final days of the World War I, he was appointed a member of the National Council of Slovenes, Croats and Serbs—the body established with the aim of political unification of the South Slavs.
Following proclamation of the newly established Kingdom of Serbs, Croats and Slovenes, Bertić was also appointed a member of the Temporary National Representation, a provisional legislative body of the new country in 1919–1920.