PROSUN BHATTACHARYA received his Ph.D. degree in Petrology and Sedimentary Geochemistry from the University of Delhi, India in 1990. He joined Kungliga Tekniska Hogskolan in1993 and started his carrier as a Research Scientist and worked on the genesis of high fluoride groundwater in Western India. He developed expertise on solid phase characterization through detailed soil chemical studies and their bearing on the high fluoride groundwater in the region. Since 1995, he has been working on heavy metal contaminated soils which have resulted from different industrial activities, particularly the wood preservations sites contaminated by CCA, ammunition industries, and shooting in Sweden along with the studies on chemical remediation. Since 1995, he is actively engaged with the studies on the genesis of high arsenic in groundwater of the sedimentary aquifers in the Bengal Delta Plain, West Bengal and Bangladesh and devising sustainable techniques for safeguarding ground water resources. At present his primary research interest is directed towards the understanding the mechanisms of arsenic mobilization in groundwater of the sedimentary aquifers based on hydrogeochemical, sediment geochemical and stable isotopic characteristics in Bengal Delta Plain (BDP), Huhhot Alluvial Basin (HAB), Mekong Delta (MD) and the chaco-Pampean Plain of Argentina. He established the Groundwater Arsenic Research Group (GARG) at the Department of Land and Water Resources Engineering, KTH in 1999, a group which is dedicated on research on the groundwater arsenic occurrences in different parts of the world. At present GARG is collaborating with a number of universities and research organizations in India, Bangladesh, China, Australia, Argentina, Costa Rica, Bolivia, Pakistan and Ghana. He has received the title as a Docent (Associate Professor) in Groundwater Chemistry at the KTH in April 2002. Prosun has authored nearly 170 international publications in peer reviewed journals, books and conference proceedings and has organized a number of international workshops on Arsenic in Groundwater of Sedimentary Aquifers.