Marko Kallio is working at Aalto University doing multidisciplinary research about water scarcity estimation in data scarce areas with a background in environmental engineering (water management, B.Sc.) and geoinformatics (spatial analysis, cartography, M.Sc.). He has been working in the Mekong Region in various projects as a modeller in hydrology and renewable energy, both as a consultant and as a researcher. Drawing from his experience in hydrological modelling and research, he has come to the conclusion that hydrological modelling is hard. This realization led to one of Marko’s main research interests – bridging the gap between modellers and consumers of the outputs of their models. For the past few years, he has developed intuitive methods for utilizing freely and openly available hydrological information in areas where data is scarce – like the Mekong Region. Marko has frequently visited the area in the past years and hopes his research can help in ensuring a sustainable future for the whole region.