His scientific interests are in measure theory (non-additive measures), aggregation operators, decision making, fuzzy systems, functional analysis, theory of generalized functions, partial differential equations. He is the author of 390 scientific papers, 9 monographs and 15 textbooks. He has 11 300 citations. He was the Editor of proceedings of many international conferences, and he is the main organizer of the traditional international conferences on computational intelligence SISY (slika 3)since 2003. He is a collaborator for the Encyclopaedia of Mathematics, Kluwer Academic Publishers, Dordrecht (Springer). He has supervised 10 M.A., 9 Ph.D. theses and has given 40 invited lectures and organized several scientific seminars. Currently he is the editor in the journal Fuzzy Sets and Systems (Elsevier), and Soft Computing (Springer). He is a member of the Editorial Board of the journals Tatra Mountains Mathematical Publications, Acta Polytechnica Hungarica, Archive of Oncology, The Journal of Nonlinear Science and Applications (TJNSA), Panoeconomicus, Applied Computational Intelligence and Soft Computing , and YUJOR, a reviewer for Zentralblatt für Mathematik and Mathematical Reviews, a referee for more than 30 international and 4 Serbian journals, and a member of Austrian Mathematical Society (OMG), and American Mathematical Society (AMS). He has taught courses in Partial Differential Equations, Real Analysis, Complex Analysis, Decision Theory, Fuzzy Systems, Optimization Methods, Ordinary Differential Equations, Measure Theory. He was in 1986 and 1988 a Visiting Researcher at ETH in Zurich, Switzerland; in 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2001, 2002, 2004 at the University Johannes Kepler in Linz, Austria, where he was a Visiting Professor in 1997, 2003, 2006 (giving PhD courses); in 1994 at the University in Potenza; in 1992, 1994, 1996, 2001 (giving Ph.D. courses) at the University Federico II in Naples, Italy; Universite Paul Sabatier, Toulouse, France, in 1999; University "La Sapienza", Rome, Italy, in 1999, 2003,University Pantheon-Sorbonne,Paris,France in 2008 (Ph.D. courses), universities in Beijing 2010.
He is a full member of Academy of Sciences and Arts of Vojvodina, and its president from 2008. He is a member of European Academy of Sciences (EAS, Belgium), since 2004. He is a member from the outside of the Public Organ of Hungarian Academy of Sciences, since 2000. He was full professor at the University in Novi Sad, and now he is full professor at the Singidunum University in Belgrade, and at the Obuda University in Budapest. He obtained in 2003 the October prize of the city Novi Sad for his scientific work. He was a member of Accreditation Commission for High Education of Serbia 2006-2014, and its president 2013-2014. He is a member of National Council of Higher Education of Serbia from 2014.