Professor Mladen Garašić, PhD, after serving as the secretary of the Union Internationale de Speleologie (UIS) from 2013 to 2017, was choosen for the same duty for the next four years, from 2017 to 2021, while, in the same time, he serves as the vice president of the Fédération Spéléologique Européenne (FSE) from 2016 to 2019.