Graduated from the Faculty of Economics in Osijek, majoring in Marketing - Management, where he also completed post-graduate studies, majoring in Entrepreneurship, and received his doctorate on the subject of "Management of food product brands".

Since 2013, Baltazar Zaprešić has been permanently employed at the Polytechnic. Among other things, the professional experience of Assoc. Prof. Ph.D. Ružića has held various management positions, such as deputy director of packaging sales at Belišće d.d., director of the commercial sector at Kutjevo d.d., member of the board at Kutjevo d.d., member of the supervisory board at Đakovacki vinim d.d., sales director at Agrokor vinim and sales director at Belje d.d.

As head of the Consultative Center in Osijek, he greatly contributed to the development and positioning of the Polytechnic in the region of Eastern Croatia. In February 2020, Associate Prof. Ph.D. Ružić assumed the position of vice dean for teaching, students, finance and business, and in July of the same year he assumed the position of acting dean. In January 2021, the Council will confirm him as the new dean of the Polytechnic for a mandate period of four years.