Dr. Vinod Kumar Gupta is Professor of Chemistry at Indian Institute of Technology Roorkee, Roorkee, India, and is currently working as SARCHI Chair Professor in the Applied Chemistry Department at the University of Johannesburg, Johannesburg, South Africa. He has published more than 500 papers with 37,000 citations and an h-index of 127. He is editor of many journals and is on the editorial board of more than 20 international journals. He has more than 30 years of research experience in environmental engineering, electro-analytical chemistry, chemical sensors, and waste management.