is a Professor in the School of Environmental Sciences, Jawaharlal Nehru University, and New Delhi, India. His research area is in the field of Hydro geochemistry from inland and coastal surface and ground water and their resource management. He has got 18 yrs of teaching experience ( PG) and research experience in this subject. He has taught in numerous universities in India and abroad. He has guided quite a number of PhD research students on ground water quality and modeling aspects. He has widely travelled all over the world for the advanced research work in ground water. He is also a recipient of various international and national scholarship and had collaborations with institutes and universities reputed in ground water research in India and abroad.. He has published two dozen articles in reputed refereed journals and authored five books in these aspects. He has completed and continuing his research work on ground water got from Indian and international agencies.