Dr. Rengaraj Selvaraj is currently working as Assistant Professor at Department of Chemistry College of Science Sultan Qaboos University, Oman. He received his Ph.D. in Chemistry from Anna University, Chennai, Tamil Nadu, India. He has received 17 national and international awards. His working experience includes appointed as Visiting Professor at Kwangwoon University, Seoul, South Korea, Visiting Faculty at Department of Chemistry, College of Science, SQU Muscat, Sultanate of Oman, and Contract Professor at Seoul National University, South Korea, Research Assistant, and Senior Research Fellow at Anna University, Post Doctoral Fellow at Kwangju Institute of Science and Technology South Korea, The Hong Kong Polytechnic University, and Department of Energy and Environment Ecole Des Mines de Nantes France. He also guided/guiding many research projects of PhD and MSc students at Sultan Qaboos University, Oman. His area of research interest focuses on encompasses various novel applications of Analytical and Environmental Technologies for Water and Wastewater Treatment and to combine the Nanotechnology (NT) with Environmental Technology (ET) in order to develop Environmental friendly Nanomaterials and novel Nanoscale Systems. He is focusing on the fusion of NT and ET, such as Inorganic/Organic Hybrid Nanoporous Materials, Semiconductor based Nano Materials and Nanoparticles, based on the knowledge and techniques of different disciplines-Analytical Chemistry, Environmental Chemistry, Chemical Engineering, Materials Science, Chemistry, Biology and Solid-state Physics. He is member of some professional organizations like one of the Board of Directors of Pacific Basin Consortium for Environment and Health, USA, American Chemical Society (ACS), Advisory council member of Aksheya College of Engineering, Chennai., Tamil Nadu., INDIA, R & D Advisory Board for Bharath University, Chennai, Tamil Nadu, INDIA, member of Association of Environmental Engineering and Science Professors (AEESP), USA, American Water Works Association, European Association of Chemistry and the Environment, Water Environment Federation, USA, and Hawaii Water Environment Association. He is also serving as member of editor board and peer reviewer for more than 50 International Journals. He has published more than 60 papers in the International and National Journals, 14 papers in the International conference proceedings and 54 conference abstracts contributed as author/co-author. He also delivered 30 invited lectures at different institutes.