He is a professor of mathematics in the Faculty of Textile Technology at the University of Zagreb,[1] Croatia, and is a full member of the Croatian Academy of Sciences and Arts.

Pečarić was born in Kotor, Montenegro (at the time part of Yugoslavia) on 2 September 1948,[2][3] where he remained to attend elementary and high school.

[4] He studied at the University of Belgrade's Faculty of Electrical Engineering for his undergraduate and master's degrees, which he completed respectively in 1972 and 1975.

[11] For example, Pečarić has advocated for the return of the World War II-era fascist salute Za dom spremni.

[16][17][11] This last prompted the Simon Wiesenthal Centre to advocate the Croatian government to ban publications denying the war crimes of the Ustaša.