Dr. Mu. Naushad is assistant professor in the Department of Chemistry, King Saud University, Saudi Arabia. He earned his MS and PhD in analytical chemistry from Aligrah Muslim University, India. He is the author of more than 60 research articles and several book chapters of international repute. Dr. Naushad is editor/editorial member of more than 30 international journals, and is also the editor of a number of books. Mohammad Rizwan Khan is assistant professor in the Department of Chemistry, King Saud University, Saudi Arabia. He earned his BS and MS in chemistry from the Aligrah Muslim University, India, and his PhD in analytical chemistry from the University of Barcelona, Spain. Dr. Khan has extensive research experience in multidisciplinary fields of analytical chemistry and environmental science. He has published several book chapters and research papers in international peer-reviewed journals.