Assistant Director (Research and Development), Central Environmental Authority, Sri Lanka.
Senior Environmental Scientist, Senior Advisor to Centre for Environmental Justice, Chairperson, Friends of the Earth International.
Professor in Environmental Science, Department of Zoology and Environment Sciences and the Founding Director, Center for Environmental Initiatives, Faculty of Science, University of Colombo, Sri Lanka.
Professor, Department of Management & Organization Studies, Faculty of Management and Finance, University of Colombo, Sri Lanka.
Senior Lecturer, Department of Public and International Law and the Founding Director of Centre for Environmental Law and Policy (CELP), Faculty of Law, University of Colombo, Sri Lanka.