Graduated as Ph D from Royal Inst. of Technology in Stockholm 1973. A B Sc in medicine was gained Karolinska Inst. in Stockholm 1971 to get a background in water and health issues, important throughout the professional activities. Professor in groundwater chemistry at Royal Inst. of Technology in Stockholm from 1986. Worked in India for three years for Central Groundwater Board of India. Participated in research projects in Finland, Norway, Italy, Albania, Vietnam, Laos, Thailand, Bangladesh, Oman, Eritrea, Botswana, Ghana and Mali. Arsenic problems in groundwater in Bangladesh and West Bengal in India have been a dominating occupation during the last years. Excess fluoride in groundwater causing dental and skeletal fluorosis in India has been another important study subject. Other important issue are coastal aquifers in Kerala in India and in Oman.