István Gábor Hatvani is a senior research fellow at the Paleoclimate 2ka Research Group of the Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences. In addition, he is also an invited lecturer of graduate and Ph.D. courses at the Faculty of Science of Eötvös Loránd University. In his research, he is primarily interested in the background of past climate changes with a special focus on the geostatistical and spectral analysis of geochemical and paleoclimate datasets. He is also involved in the spatiotemporal recalibration of the water quality monitoring networks of surface and subsurface water systems along with their comprehensive status assessment with modern mathematical methods. During his graduate years, he received the Excellent Student of the Faculty of Science award (ELTE) twice and the Dr. Pauka Imre Prize (2010), as well as the “Habilitas” fellowship of the Hungarian Development Bank (2011). During his PhD studies and afterwards, he was granted the Junior Prima Prize (2015), the Young Scientist Prize for Environmental Research (2016), the Academic Youth Award (2018), the Szádeczky-Kardoss Elemér Prize (2018), and the Danubius Young Scientist Award given by the Austrian Federal Ministry for Science, Research and Economy, Institute for the Danube Region and Central Europe (2017). He is the author of approx. 80 international SCI papers with more than 1000 independent citations. Out of these 15 were published in journals belonging to the top 10% of their subject area and five to the top 1%, his cumulative sum IF 210. István also works as an editor at Open Geosciences, Central European Geology and International Journal on Geomathematics. Additionally, he works as the secretary of the Geomathematics Subcommittee of the Hungarian Academy of Sciences (2018–2023) and the Geomathematical & Informatics Section of the Hungarian Geological Society (2015–2023), and is a member of the International Association of Mathematical Geosciences (2014–). István frequently organizes international and national conferences, and is fond of giving popular science lectures in Hungary and abroad.