Prof. Dr. Iztok Tiselj earned his degree in Physics from the University of Ljubljana in 1991, followed by a PhD in Nuclear Engineering from the same university in 1997. Since 1991, he has been employed as a researcher at the Jožef Stefan Institute, and in 2012 he was appointed full professor of nuclear engineering at the Faculty of Mathematics and Physics, University of Ljubljana.

His major research interests lie in nuclear thermal hydraulics, with a particular focus on simulations of two-phase flows using two-fluid models and interface tracking methods. He has also conducted direct numerical simulations of heat transfer in near-wall turbulent flows. In recent years, his work has included experimental studies of two-phase flows, aimed at providing benchmark data for validating interface tracking schemes.

Professor Tiselj has contributed to several industrial projects for the Nuclear Power Plant Krško and has authored around 70 peer-reviewed journal articles in the fields of nuclear engineering, fluid mechanics, heat transfer, and computational physics. In addition, he has presented around 200 papers at international conferences.

In the academic sphere, he has served as Chair of Nuclear Engineering at the Faculty of Mathematics and Physics, University of Ljubljana since 2010, and has supervised numerous PhD, MSc, and BSc students.

Beyond academia, he is a member of the High Scientific Council of the European Nuclear Society, representing Slovenia, and a member of the Slovenian Academy of Engineers. He has also actively contributed to public discourse on nuclear energy and energy policy, with around 20 appearances and publications in Slovenian and international media, including radio, television, and newspapers.