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 Director of the Korea Biochar Research Center. His positions include Adjunct Professor at the University of Wuppertal, Germany, Adjunct Professor at the University of Southern Queensland, Australia, Guest Professor at China Jiliang University, China 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 backgroud 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 400 research papers, 21 of which were ranked as ESI top papers (19 nominated as "Highly Cited Papers" and 2 nominated as "Hot Papers"). Prof. Ok maintains a worldwide professional network through his service as an Associate Editor for Environmental Pollution and Critical Reviews in Environmental Science and Technology, and as a Member of the Editorial Boards of for 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 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 chair and organizer of many internationally leading conferences, such as 2nd Contaminated Land, Ecological Assessment and Remediation (Korea, 2014), 3rd Asia Pacific Biochar Conference (Korea, 2016), 2nd Biological Waste as Resource (Hong Kong, 2017), and 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.