The main research interests of Dejan Zupan are mechanics, numerical methods in structural and civil engineering, structural dynamics, finite rotations, strain-objective methods, non-linear materials, theory of distributions, stochastic methods and structural safety. He developed a computer program INVARJON for geometrically in materially non-linear analysis of spatial frames. He published 40 original scientific papers, including 32 articles in highly ranked journals indexed by SCI database. His scientific work and participation in the international community is recognized by more than 400 citations without self-citations in the period of last ten years.