He has done extensive research on drinking water, occupational exposure to pesticides, and their association with chronic kidney disease, which highly prevalent in rural farming communities. Together with his doctoral advisor,
Sarath Gunatilake at California State University, Long Beach, Prof. Jayasumana was awarded the
AAAS Award for Scientific Freedom and Responsibility offered by the American Association for the Advancement of Science in 2019 for this work, citing "challenging circumstances." It is the highest achievement by a Sri Lankan scientist to date. Jayasumana has authored 30 papers in indexed international journals. Further, he is an author of the chapter “
chronic tubulointerstitial nephritis” in the Oxford Text book of Medicine. Prof. Jayasumana is included in the world's top 2% scientists identified by Stanford University in both 2021,2022 and 2023. The list was created by Professor John P. A. Ioannidis from Stanford University and his research team. It contains a publicly available database of 100,000 top scientists that provides standardised information on citations, h-index, co-authorship-adjusted hm-index, citations to papers in different authorship positions, and a composite indicator. Jayasumana's contribution to the field of nephrology and toxicology with his postdoctoral supervisor Professor Marc de Broe of the University of Antwerp, Belgium is highly recognised on many international platforms. He has carried out pioneering work in establishing reverse osmosis water purification plants in rural villages affected by Chronic Kidney Disease (CKD) in Sri Lanka, based on his vision of providing “toxin-free water to mitigate CKD.”Today, nearly 80% of the population—about three million people—in endemic regions benefit from this initiative. The project has led to a dramatic reduction in disease incidence and is widely recognized as one of the most successful public health interventions in modern Sri Lanka. Channa Jayasumana is the author of seven books. In addition to medicine, his contributions are in the fields of history and philosophy. == Politics ==