Dr. Shakir Ali is a senior research fellow in the Department of Geology, University of Delhi, Delhi, India. He works on the groundwater global contaminants, particularly fluoride. With more than twenty research articles, he has received more than 700 google scholar citations till date. He earned master degrees in hydrogeology from Indian institute of Technology Bombay and University of Delhi and submitted his Ph.D. at University of Delhi. He has more than ten years of research and teaching experience in the field of hydrogeology. Dr. Asaad Mater Armanuos is an associate professor at Tanta University, Irrigation and Hydraulics Engineering Department, Faculty of Engineering, Tanta University, Tanta, Egypt. His background is in Civil Engineering as he graduated from Civil Engineering Dept. in 2008 and worked as a demonstrator in the same faculty in 2008 also. He got his M.Sc. in 2013 from Tanta University in groundwater hydrology with title: Use of double sheet piles to control the contaminant transport through the soil. He got an Egyptian government full scholarship for Ph.D. study, E-JUST from 2014 to 2017 in environmental engineering department and spent one year at Tokyo Institute of Technology, Tokyo, Japan, as an apart of his Ph.D. scholarship. He has received more than 460 google scholar citations till date. He participated as a reviewer for more than twenty high ranked international journals. His research interest is related to groundwater contamination control, water resources management, saltwater intrusion control, and groundwater engineering, groundwater hydraulics, and groundwater hydrology.