Dr. Yong Sik Ok is Full Professor in the Division of Environmental Science and Ecological Engineering, Korea University, Seoul, Korea, where he also serves as the Director of the Korea Biochar Research Center. He also served a number of positions worldwide including Honorary Professor at the University of Queensland, Australia, Adjunct Professor at the University of Wuppertal, Germany and Guest Professor at Ghent University Global Campus, Ghent University, Belgium. Prof. Ok holds B.S. (1998), M.Sc. (2000) and Ph.D. (2003) from the Division of Environmental Science and Ecological Engineering, Korea University, Seoul. Prof. Ok was a Postdoctoral Fellow at the Department of Renewable Resources, University of Alberta, Canada and held Visiting Professorships in the Department of Renewable Resources (University of Alberta), in the Faculty of Bioscience Engineering (Ghent University), in the Department of Civil and Environmental Engineering (Hong Kong Polytechnic University) and in the Department of Chemical and Biomolecular Engineering (National University of Singapore). Prof. Ok's academic background covers waste management, bioavailability of emerging contaminants, and bioenergy and value-added products such as biochar. Prof. Ok also has experience in fundamental soil science and remediation of various contaminants in soils and sediments. Together with graduate students and colleagues, Prof. Ok has published over 550 research papers, 36 of which were ranked as ESI top papers (32 nominated as "Highly Cited Papers" and 4 nominated as "Hot Paper"). Prof. Ok maintains a worldwide professional network through his service as a Co-Editor for Critical Reviews in Environmental Science and Technology, and Associate Editor for Environmental Pollution, and as a Member of the Editorial Boards of Chemosphere, Journal of Analytical and Applied Pyrolysis and several other international scientific journals. In addition, Prof. Ok has served as a Guest Editor for many leading journals, such as Chemical Engineering Journal, Journal of Hazardous Materials, Bioresource Technology, Science of the Total Environment, Chemosphere, Plant and Soil, Journal of Environmental Management, Applied Geochemistry, Environmental Geochemistry and Health, Environmental Science and Pollution Research, and Geoderma. Prof. Ok is the founding chair and organizer of many internationally leading conferences, such as International Conference on Heavy Metals in the Environment (ICHMET 2020, Korea), The 3rd International Conference on Biological Waste as Resource (BWR 2018, Hong Kong), Bioresources, Energy, Environment and Materials Technology (BEEM 2018, Korea), The 4th International Conference on Contaminated Land, Ecological Assessment and Remediation (CLEAR 2018, Hong Kong) and many others. Prof. Ok has been involved in numerous national and international commissions and committees as an active member, and regularly serves as an external reviewer for national and international funding agencies.