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Founder President- Life Cycle Assessment and Design for Sustainability Network, Sri Lanka
Member- American Chemical Society
Member- Sri Lanka Energy Managers Association
Chairman, Board of Study of General Programme in Engineering
Deputy Director, Centre for Environmental Studies, University of Peradeniya
1. Synthesis of value added products from Sri Lankan minerals
2. Air pollution and Health impacts
3. Gasification and Pyrolysis
• National Science Foundation research grant for “Synthesis and Commercialisation of value added products from Sri Lankan Dolomitic Lime”, Rs. 20,019,355/= in 2016
• National Research Council Grant for "synthesis of value added products from Sri Lankan Dolomitic Lime" Rs. 1.2 Million
• Measurement of Persistent Organic Pollutants in Breast Milk in Sri Lanka, Funded by Chinese Academy of Sciences and Ministry of Environment Sri Lanka - Rs. 5.5 Million
• University Research Grants for the investigation on “Ployaromatic Hydrocarbons exposure assessment in urban and suburban Kandy area” Rs-400,000 in 2007
• Vehicle Emission Testing Trust Fund research grant for “Air quality monitoring, modeling and health impact assessment in Kandy, Sri Lanka , Rs. 16,000,000/= in 2014
• National Research Council research grant for “Synthesis of Value Added Products from Sri Lankan Dolomitic Lime” Rs. 16,000,000/= in 2011
Journal Publications
1. Nirodha Abayalath, Indeepa Malshani, Rajitha Ariyaratne, Shizhen Zhao, Guangcai Zhong, Gan Zhang, Aruna Manipura, Anoma Siribaddana, Parakrama Karunaratne, Suranga P. Kodithuwakku. Characterization of airborne PAHs and metals associated with PM10 fractions collected from an urban area of Sri Lanka and the impact on airway epithelial cells, Chemosphere, Accepted for publication
2. M.R. Abeywardena, M.A.D.H. Yashomala, R.K.W.H.M.K. Elkaduwe, D.G.G.P. Karunaratne, H.M.T.G.A. Pitawala, R.M.G. Rajapakse, A. Manipura, M.M.M.G.P. G. Mantilaka, Fabrication of water-repellent polyester textile via dip-coating of in-situ surface-modified superhydrophobic calcium carbonate from dolomite, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 629 (2021) 127397
3. Abewardana M, Elkaduwa., R.K.W.H.M.K., D G G P, Karunaratne Mantilaka, M.M.M.G.P.G., Pitawala, H.M.T.G.A., Karunaratne, D.G.G.P. Rajapakse, R.M.G., Surfactant Assisted Synthesis of Precipitated Calcium Carbonate Nanostructures using Dolomite: Effect of pH on Morphology and Particle Size, Advanced Powder Technology, November 2019.
4. Tharindu Ranathunge, D G G P Karunaratne, R.M.G. Rajapakse, Davita Watkins, Doxorubicin loaded magnesium oxide nanoflakes as pH dependent carriers for simultaneous treatment of cancer and hypomagnesemia, Nanomaterials 2019, 9, 208; doi:10.3390/nano9020208
5. Weerasundara L, Amarasekara RW, Magana-Arachchi DN, Ziyath AM, Karunaratne DG, Goonetilleke A, Vithanage M, Microorganisms and heavy metals associated with atmospheric deposition in a congested urban environment of a developing country: Sri Lanka, Sci Total Environ., Volumes 584–585, 15 April 2017, Pages 803-812 (2017)
6. Y.R. Somarathna , M.M.M.G.P.G. Mantilaka, D.G.G.P. Karunaratne, R.M.G. Rajapakse, H.M.T.G.A. Pitawala, and K.G. Upul Wijayantha, Synthesis of high purity calcium carbonate micro and nano-structures on polyethylene glycol templates using dolomite, Cryst. Res. Technol. 51, No. 3, 207–214 (2016)
7. Mantilaka, M.M.M.G.P.G. Pitawala, H.M.T.G.A., Karunaratne, D.G.G.P. Rajapakse, R.M.G., Nanocrystalline magnesium oxide from dolomite via poly(acrylate) stabilized magnesium hydroxide colloids, Colloids and Surfaces A; Physicochemical and Engineering Aspects 02/2014; 443:201–208.
8. Mantilaka, M.M.M.G.P.G., Pitawala, H.M.T.G.A. Rajapakse, R.M.G. Karunaratne, D.G.G.P., Upul Wijayantha, K.G. Formation of hollow bone-like morphology of calcium carbonate on surfactant/polymer templates, Journal of Crystal Growth 02/2014
9. D.G.G.P. Karunaratne, Environmental and Health Impacts of Nanotechnology: Need for a Precautionary Approach- Editorial Article, Journal of Chemical Engineering Research Studies 2015, 2(1): E1
10. Gayani Chathurika Pathiraja, Pavithra Bhakthi Jayathilaka, Chandima Weerakkody, Parakrama Karunaratne, Nadeeshani Nanayakkara, Comparison Study of Dimensionally Stable Anodes for Degradation of Chlorpyrifos in Water Current Science, Vol. 107, No. 2, 25 July 2014
11. Mantilaka, M. M. M. G. P. G., Rajapakse, R. M. G., Karunaratne, D. G. G. P., Pitawala, H. M. T. G. A., Surfactant-assisted synthesis of pure calcium carbonate nanoparticles from Sri Lankan dolomite, Journal of National Science Foundation, Sri Lanka 2014 42 (3): 221-228 DOI: http://dx.doi.org/10.4038/jnsfsr.v42i3.7398
12. K.G. Chathuranga Senarathna, M.M.M.G.P.G. Mantilaka, T.A. Nirmal Peiris, H.M.T.G.. Amarasooriya Pitawala, D.G.G.P. Karunaratne, R.M.G. Rajapakse, Convenient routes to synthesize uncommon vaterite nanoparticles and the nanocomposites of alkyd resin/polyaniline/vaterite: The latter possessing superior anticorrosive performance on mild steel surfaces, Electrochimica Acta, 12/2013; 117(C):460-46
13. H.M.T.G.A.. Pitawala, D.G.G.P. Karunaratne, N. Silva, Removal of Aqueous Phosphate and Phenol by Adsorption on Clayey Peat, Laterite and Red Earth, Journal of Geological Society of Sri Lanka, 11/2013; 15:57-67
14. T.B.N.S. Madugalla, M.M.M.G.P.G. Mantilaka, R.M.G. Rajapakse, H.M.T.G.A.. Pitawala, D.G.G.P. Karunaratne, Synthesis of precipitated calcium carbonate: potential use of Sri Lankan marble, Journal of Geological Society of Sri Lanka. 11/2013; 15:85-92
15. M.M.M.G.P.G. Mantilaka, R.M.G. Rajapakse, D.G.G.P. Karunaratne, H.M.T.G. A Pitawala, Preparation of amorphous calcium carbonate nanoparticles from impure dolomitic marble with the aid of poly(acrylic acid) as a stabilizer, Advanced Powder Technology 25 (2014) 591-598.
16. H.M.T.G.A. Pitawala, T.B.N.S. Madugalla, D.G.G.P. Karunaratne, Use of Carbonatites in the Production of Precipitated Calcium Carbonate: A Case Study from Eppawala, Sri Lanka, Natural Resources Research, September, 2013
17. Madugalla T.B.N.S., Mantilaka M.M.M.G.P.G., Rajapakse R.M.G., Pitawala H.M.T.G.A., D.G.G.P. Karunaratne, Synthesis of Precipitated Calcium: Potential Use of Sri Lankan Marble, Journal of Geological Society of Sri Lanka Vol. 15 (2013), 85-92
18. M.M.M.G.P.G. Mantilaka, D.G.G.P. Karunaratne; R.M.G. Rajapakse, H.M.T.G.A. Pitawala, Precipitated Calcium Carbonate/Poly(methyl methacrylate) Nanocomposite using Dolomite: Synthesis, Characterization and Properties, Powder Technology, 235 (2013) 628-632.
19. Menike, AMW, Shanthini R, Kalpage CS, DGGP Karunaratne and Kankanamge , A. Chlorpyrifos contamination of fresh water in a commercial vegetable cultivation area in Sri Lanka, and the factors affecting the contamination. J.Natn.Sci.Foundation Sri Lanka 2012 40 (4): 333-344
20. Wickramasinghe, A.P., Karunaratne, D.G.G.P. and Sivakanesan, PM10-bound polycyclic aromatic hydrocarbons: Biological indicators, lung cancer risk of realistic receptors and ‘source-exposure-effect relationship’ under different source scenarios, Chemosphere, Volume 87, Issue 11, June 2012, Pages 1381-1387
21. Wickramasinghe, A.P., Karunaratne, D.G.G.P. and Sivakanesan, R., PM10-bound polycyclic aromatic hydrocarbons: concentrations, source characterization and estimating their risk in urban, suburban and rural areas in Kandy, Sri Lanka, Atmospheric Environment Volume 45, Issue 16, May 2011, Pages 2642-2650
22. Fernando, W .J. N., Othman, M.R., and Karunaratne, D.G.G.P., Agitation speed and interfacial mass transfer coefficients in mass transfer dominated reactions. International Journal of Engineering & Technology IJET-IJENS Vol: 11 No: 01, February 2011.
23. Gulyurtlu, I., Karunaratne, D.G.G.P., and Cabrita, I. “A Study of the Effect of Operating Parameters on PAH Formation During the Combustion of Coconut Shell in a Fluidised Bed.” Fuel, 82 (2003) 215–223.
Conference- Full Paper
1. M. M. M. G. P. G. Mantilaka, H. M. T. G. A. Pitawala, D. G. G. P. Karunaratne, R. M. G. Rajapakse, Stearic acid coated calcium carbonate nanocrystallites from dolomitic marbles for polymer industries, Peradeniya University International Research Sessions, July 2014, Faculty of Science, University of Peradeniya, Sri Lanka – Accepted for publication
2. G. M. C. Ruwan Bandara, K. G. Chathuranga Senarathna, M. M. M. G. P. G. Mantilaka, D. G. G. P. Karunaratne, H. M. T. G. A. Pitawala, R. M. G. Rajapakse, Flame-retardant and anticorrosive surface coatings of polyaniline/magnesium hydroxide nanocomposites prepared from dolomite, Peradeniya University International Research Sessions, July 2014, Faculty of Science, University of Peradeniya, Sri Lanka
3. R. A. Amarasinghe, M. M. M. G. P. G. Mantilaka, H. M. T. G. A. Pitawala, D. G. G. P. Karunaratne, R. M. G. Rajapakse, Adsorption of methylene blue from aqueous solution by calcium carbonate nanoparticles, University International Research Sessions, July 2014, Faculty of Science, University of Peradeniya, Sri Lanka – Accepted for publication
4. M.M.M.G.P.G. Mantilaka, D.G.G.P. Karunaratne, R.M.G. Rajapakse, H.M.T.G.A. Pitawala, Synthesis and Characterization of Precipitated Calcium Carbonate/Poly (methyl methacrylate) Nanocomposite using Sri Lankan Marble, Proceedings of the 28th Annual Sessions, Geological Society of Sri Lanka, 24th Feb. 2012 Colombo, Sri Lanka.
5. M.M.M.G.P.G. Mantilaka, H.M.T.G.A. Pitawala, R.M.G. Rajapakse, D.G.G.P. Karunaratne, Nanomaterials from Sri Lankan Marbles: A novel approach for value added products, Proceedings of the 29th Annual Sessions, Geological Society of Sri Lanka, (2013) 105-108.
6. Wijeratne, B., Karunaratne, D.G.G.P., “Health risk associated with particulate bound PAH in selected indoor Environments in KANDY, Sri Lanka”, proceedings of international conference on sustainable built environments, 2010.
7. Karunaratne, D.G.G.P., Gulyurtlu, I. and Cabrita, I. “Formation of Polycyclic Aromatic Hydrocarbons from Coconut Biomass Combustion.” World Renewable Energy Congress VII (WREC 2002) Cologne, Germany. Editor: A.A.M. Sayigh.
8. Edirisinghe, E A N K., Karunaratne D G G P., Improvement of Producer Gas Quality from a Fliudised Bed Gasifier, Presented at the annual symposium of the Sustainable Energy Authority, August 2011
Conference Abstracts
1. D G G P Karunaratne, · SHS Weerasinghe · S M W T P K Ariyaratne, Life Cycle Assessment of use of Biochar as a soil amendment, Indian Life Cycle management Conference, New Delhi, India
2. M.M.M.G.P.G. Mantilaka, W.P.S.L. Wijesinghe, R.M.G. Rajapakse, D.G.G.P. Karunaratne, H.M.T.G.A. Pitawala, Surfactant-Assisted Synthesis of Nanosized Precipitated Calcium Carbonate and Magnesium hydroxide from Marble, Book of abstracts of the Peradeniya University Research Sessions, Sri Lanka, Vol.17, p 182, 2012.
3. Madugalla, T.B.N.S., Pitawala, H.M.T.G.A. and Karunaratne, D.G.G.P., Characterisation of Sri Lankan marble by petrographical methods Book of abstracts of the Peradeniya University Research Sessions, Sri Lanka, Vol.17, p 214, 2012.
4. Madugalla, T.B.N.S., Pitawala, H M T. G. A. and Karunaratne, D.G.G.P., 2013. Petrographic and Geochemical Characteristics of Marbles in Central Sri Lanka; Potential Applications in Industries, Geological Society of Sri Lanka (Abs.), Proceedings of the 29th annual session.
5. Wickramasinghe A.P., Karunaratne D.G.G.P., 2012. Public health risk of lung cancer due to PM10-PAH exposure in Kandy, Sri Lanka. Proceedings of the “Air That We Breathe” 5th National Symposium on Air Resource Management in Sri Lanka, May 11 2012, Taj Hotel, Colombo, 7-8.
6. Menike AMW, Shanthini R, Kalpage C.S., Karunaratne DGGP., Analysis of Chlorpyrifos in soil at Marassanna vegetable cultivation area, Annual Transactions of the Institution of Engineers, Sri Lanka (IESL) 2011, 398-405
7. Wickramasinge, P., Karunaratne, D.G.G.P., “Development of a sampling and analysis method for PAH in atmosphere”, Annual Research Sessions, University of Peradeniya, Sri Lanka, November 30, 2008.
8. Wickramasinge, P., Karunaratne, D.G.G.P., “Atmospheric PAH levels in Kandy, Sri Lanka”, Annual Research Sessions, University of Peradeniya, Sri Lanka, November 30, 2008.
9. Editor, Proceedings of the International Conference on “Mitigation of the Risk of Natural Hazards”, March 2007. ISBN 955-589-099-1
10. Member of the editorial board, Proceedings of the Peradeniya University Research Sessions 2007
11. Karunartatne, D.G.G.P., Ratnayake, U., Proceedings of the International Conference on “Mitigation of the Risk of Natural Hazards”, 2007.
12. Samarathunga, I.R., Karunaratne, D.G.G.P., “ Effect of Process Parameters on the Quality of Instant Tea”, Annual Research Sessions, University of Peradeniya, Sri Lanka, November 30, 2007.
13. Samarathungea, I.R., Karunaratne, D.G.G.P., “ Application of Electro-Coagulation for the Treatment of Wastewater from Vehicle Service Stations”, Annual Research Sessions, University of Peradeniya, Sri Lanka, November 30, 2007.
14. Weliwegamage, U.S.K., Karunaratne, D.G.G.P., PITAWALA, H.M.T.G.A., “Interaction Between Magenta and Read Earth in Adsorptive Removal of Dye From Effluent Waters” Annual Research Sessions, University of Peradeniya, Sri Lanka, November 30, 2006.
15. Karunaratne, D.G.G.P., Wickramasinghe, H.K., Pathmasiri, M.M.R., Vimal Nadeera, H.A., “Application of Gasification in Lime Production” Annual Research Sessions, University of Peradeniya, Sri Lanka, November 30, 2006.
16. Karunaratne, D.G.G.P., “Formation of Polycyclic Aromatic Hydrocarbons from Coconut Biomass Combustion”, Thesis submitted for the degree of Doctor of Philosophy in the University of Nova De Lisboa, Faculty of Science and Technology, Lisbon, Portugal, 1999.
17. Karunaratne, D.G.G.P. and Gunawardana, W.M.N. “Sampling and Analysis of Metallic Pollutants in the Atmosphere.” Annual Research Sessions, University of Peradeniya, Sri Lanka, October 30, 2002.
18. Karunaratne, D.G.G.P., Upul Kumara, M.A.S., “Baggase Fly Ash as a Cementing Material”, International Seminar on “The Engineer in Sustainable Social and Economic Development- Regional Contribution towards Agenda 21” October 2002, Colombo, Sri Lanka.
19. Karunaratne, D.G.G.P. “Sampling and Analysis of Polycyclic Aromatic Hydrocarbons in Combustion Products.” Annual Research Sessions, University of Peradeniya, Sri Lanka, November 16, 2001.
20. Rajakaruna K.A.S.G and Karunaratne D.G.G.P. “Control of Particulate emissions from dolomite industry”, Annual Research Sessions, University of Peradeniya, Sri Lanka, November 16, 2001.
21. Peiris, K.M.P., Karunaratne, D.G.G.P., “Biogas generation from spent wash and filter mud from sugar indusry ” Annual Research Sessions, University of Peradeniya, Sri Lanka, November 16, 2001.
22. Abeyratne, W.G.N.S., Karunaratne, D.G.G.P., Herath, G.B.B. “Analysis on control of pollution from waste water from Textile Industry., Annual Research Sessions, University of Peradeniya, Sri Lanka, November 16, 2001.
23. Karunaratne, D.G.G.P., Jeyalalitha, E., Analysis of Polycyclic Aromatic Hydrocarbons in Ambient Air, Annual Research Sessions, University of Peradeniya, Sri Lanka, November 16, 2001.
24. Karunaratne, D.G.G.P. et al. “Irradiation of Polycyclic Aromatic Hydrocarbons in Coconut Oil.” Presented at the Annual Session of “Chemistry of Sri Lanka,” 1997.
25. Karunaratne, D.G.G.P. and Walgama, K.S. “Control strategies for Bioreactors.” Presented at the Annual Congress of the Sri Lankan Association for the Advancement of Science, 1994.
• Local Expert, Preparation of Stage 1 Kigali HFC Implementation Plan in Sri
Lanka (Ministry of Environment), 2023
• Environment Expert, Conducting Baseline Survey and Data Collection for the
Development of a GEF VII Funded Project on Chemical Management in Sri
Lanka (UNDP), 2022
• Environment Expert, Building technical capacity of institutions to implement
2050 Carbon Net Zero Road Map and Strategic Plan for Sri Lanka (Ministry of
Environment), 2022
• Team Leader and Environment Expert, Strengthening National Capacity for
phasing out mercury added products and environmentally sound
management of waste consisting of, contaminated with, and containing
mercury in Sri Lanka (Ministry of Environment) 2022
• Environment Expert. Development of comprehensive localised and gender
sensitive Health Care Waste Management Systems in two health care facilities
in Monaragala and Kalmunai in Sri Lanka (UNDP) 2021
• Consultant Assessment of feasibility of a sanitary/secured landfill facility for a
pilot demonstration for healthcare and hazardous management, UNDP, 2021
• Environmental Expert - Rapid Assessment of Health Care Waste
Management in Sri Lanka, Ministry of Health
• National Expert for Mitigation Assessment in Energy and Industry, Third
National Communication,
• Member, Inter Agency Expert Working Group, SWITCH-Asia Sustainable Consumption & Production National Policy Support Component Sri Lanka, 2017 to date
• Team Leader- Curriculum Development and Deployment on Persistent, Bioaccumulative, and Toxic Chemicals (PBTs), Ministry of Mahaweli Development and Environment, 2016-2018
• UNIDO appointed national expert on unintentional persistent organic pollutants (UPOPs) for the updating on National Implementation Plan for POP management 2014-15.
• Consultant to the Ministry of Mahaweli Development and Environment on Preliminary Study of Open Burning in Sri Lanka (2015)
• Chairman, National Level Scientific Advisory Panel for the project “Biochar Systems for Developing Countries” - Funded by the APN, (2014)
• Member, Officials' Committee on Fuel Quality Improvement, Ministry of Environment and Renewable Energy, 2014
• Member, Inter Agency & Expert Working Group (IAEWG), Switch- Asia project on Sustainable Consumption and Production, (Since August 2015)
• Member, working group, Implementation of the Laws and Regulations on Using Plastic, Polythene and Asbestos in Sri Lanka, Ministry of Mahaweli Development and Environment, (Since August 2015)
• Technical consultant to the Sri Lanka Accreditation Board for the accreditation of Validation and Verification Bodies of GHG Assertions (2015)
• Technical consultant to the Small and Medium Enterprise Developers (SMED) for the IUCN funded project “Performance Improvement in selected industrial sectors” 2006
• Technical Expert, GTI funded project on energy efficiency improvement in Small and Medium Enterprises, Sri Lanka (On going)
• Member, Accreditation Board, Sri Lanka Green Building Council, (2012 - to date)
• Chairman – Committee on eco labelling of building materials. Green Building Council of Sri Lanka (2015)
• Technical Consultant to GTZ funded project to improve the performance of Sri Lankan Lime Industry (2006).
• Technical Consultant to the National Cleaner Production Centre for the UNEP funded project to develop an integrated waste management system for Matale Municipal Council Sri Lanka, 2009
• Contributor to “A Synthesis Report from Six Asian Countries on Forming a Recycle Based Low Carbon Society in Asian Countries, UN University, Japan. of the research team for the
• Chairman, Evaluation committee of Sri Lanka National Energy Efficiency Award, Sustainable Energy Authority 2011-2015
• Academic Coordinator- Certificate course on Industrial Health and Safety- Jointly offered by the University of Peradeniya,
• Member of Evaluation Panel, National Cleaner Production award, Sri Lanka. (2010-2014)
• Cleaner Production Expert, Capacity Building Workshop for Pakistani Consultants, Karachi, Pakistan 2012.
• Member of the Industry-Institute Partnership Subcommittee on Environmental Science and Technology, Ministry of Science and Technology. 2002 to 2004.
• Member of the Research and Development Committee on Energy Conservation – The Energy Conservation Fund, Ministry of Power and Energy, Sri Lanka. 2003 to 2005.
• Technical consultant of the project “Introducing Gasification Technology for Small and Medium Scale Industries”. Ministry of Science and Technology. 2005-2006
• Member of the EIA report evaluation committee of the project “augmentation of scale of mining and manufacture of single super phosphate fertilizer using local phosphate resources in north central province of Sri Lanka”
• Member of the Rapid Environmental Assessment Report evaluation committee of the project “Construction of Tsunami Permanent Housing Sites in Sri Lanka”.
• Panel member of the discussion on “Zero Carbon City” organised by the British Council, Sri Lanka on the 17th January 2007 at the Faculty of Science, University of Peradeniya Sri Lanka.
• Resource Person for the workshop conducted by the Energy Conservation Fund, Sri Lanka, on the topic of “Inclusion of Energy related topics in the School Curriculum”
• External consultant for the Small and Medium Enterprise Developers for the Study on Energy Efficiency Baseline Information, November 2006.
Invited Lectures
1. Environmental Impact & long-term sustainability of construction projects, World Accreditation Day Technical Seminar on “Accreditation: Delivering confidence in construction and the built environment”, Organised by Sri Lanka Accreditation Board, July 2017
2. Ambient air quality monitoring in Sri Lanka, Seminar on Air pollution and Human Health, Organised by the Postgraduate Institute of Science, December 2016
3. Sustainable Production and consumption in Energy Sector, National Research Summit 2016; Empowered by Research and Innovation, Organised by National Science Foundation, July 2016, Colombo
4. Health Risks of UPOPs- How safe are We? Annual Session of Collage of Community Physicians, September 2015, Colombo- Sri Lanka
5. Role of Hazardous Chemical Industry in Industrial Ecology, International conference on Safe and Secure handling of Hazardous Material, September 2015, Colombo- Sri Lanka
6. An overview of global environmental challenges, Faculty of Management, University of Peradeniya, May 2106
Doctor of Philosophy in Chemical Engineering
University of Nova, Lisbon, Portugal, March 1999.
Bachelor of the Science of Engineering.
Major in Chemical Engineering combined with Mechanical Engineering
(with First Class Honours,).
University of Peradeniya, Sri Lanka., March 1992.
Professor of Chemical and Process Engineering, Department of Chemical and Process Engineering, University of Peradeniya (July 2018 to date)
Senior Lecturer, Department of Chemical Engineering, University of Peradeniya (October 1999 to July 2018)
Research Fellow, Department of Chemical Engineering, Imperial College, London, UK (December 2009 to June 2010)
Probationary Lecturer, Department of Chemical Engineering, University of Peradeniya (April 1994 – October 1999)
Chemical Engineer Haycarb Limited, Colombo, (January 1994-April 1994)
Temporary Assistant Lecturer, Department of Chemical Engineering, University of Peradeniya (March 1992 - January 1994)
Commonwealth Research Fellow, Department of Chemical Engineering, Imperial College, London, UK (December 2009 to June 2010)