1. Invited to give a key note address, L’recherche a l’AIT, Conférence thématique AUF sciences pour l’ingénieur 7 – 8 september 2011, Phnom Penh, Cambodia.
2. S. Kumar, AIT’s renewable energy education program. Opportunities for south-south cooperation, Regional expert meeting on renewable energy use and application in Central Asia, November 25-26, 2010, Almaty, Kazakhstan.
3. Invited to give a key note address, Sustainable Energy Issues, 1st Central Asian Leadership Programme on Environment for Sustainable Development, 28-30 September 2010, Astana, Kazakhstan.
4. Invited to deliver a keynote address, Promoting renewable energy and sustainable urban development, 2010 Cities International Conference on Renewable Energy and Sustainable Development, 8-9 September 2010, Kaoshiung, Taiwan
5. Invited to give a key note address, Energy efficiency in an urban context, 2010 Asia Pacific leadership programme on environment for sustainable development, 15-21 November 2010, Shanghai, China
6. Invited to give a key note address, New Energy Forum for Sustainable Environment (NEFSE) of the Sustainable Energy and Environment Forum, Kyoto University, Kyoto, Japan , 25-28 May 2008.
7. Invited to give a key note address during the occasion of the 10th Anniversary Symposium, Institute of Global Environmental Strategies (IGES), Kobe, Japan, February 14, 2008.
8. Key note speaker, API Series � Advanced Seminar in International Environmental Studies, �Energy for Sustainable Development and Climate Change mitigation�, November 9, 2007.
9. Invited lecturer to the 2007 Asia Pacific Young Leaders Programme on Environment for Sustainable Development. And presented � Energy and Climate Change�, Shanghai 18-27 September 2007.
10. Invited to present �RETScreen: Assessing clean alternative energy initiatives through project analysis using the RETScreen tool set� by Alternative Energy Forum, Melbourne, 4-5 December 2006.
11. Invited as a panelist to the International Workshop on Engineering Education for Sustainable Development by Unesco and Tsinghua University, and presented �Energy curriculum for Sustainable Development studies�, Beijing, China , 31 October � 2 November 2006.
12. Invited to give a key note address, Association for Communication of Transcultural Study (ACT) Seminar, Zao, Japan , 27 � 29 October 2003.
13. Invited expert, Expert Meeting on Environmentally Sound Technologies (EST)/Environmentally Verification of Technology (EVT), Osaka, Japan, 7-8 March 2002.
14. Invited expert, International Seminar on Environmentally Sound Technologies (ESTs) for Energy and Land-based Transportation, Osaka, Japan, March 5-6, 2002.
15. Invited Expert, Data base for renewable energy database: Needs assessment and project development, UNESCAP/UNESCO, January 29, 2002, Bangkok., 5-6 March 2002.
16. Training course on Climate change and counter Measures, Organised by Siam Cement Company, 2 April 2002.
17. CEC Training on Industrial Energy conservation for Mongolian participants, April 2001. 18. Training course on Environmental Management Systems for Small and Medium scale enterprises, 16 May 2001.
19. Framework development for train the trainer curriculums on cleaner technology audit and applications, 13 July 2000, Bangkok, Organised by NSTDA and TEI.
20. UNU AIT Training course on Sustainable Development, 4 � 22 September 2001, AIT. 21. Invited Expert, Data base for renewable energy database: Needs assessment and project development, UNESCAP/UNESCO, January 29, 2002, Bangkok.
22. Invited to attend the Conference on Regional Research Collaboration in the service of development, Uppsala, Sweden, November 30- December 1, 2000.
23. Invited Resource person, Seminar and Workshop on Reducing barriers for the commercialisation of renewable energy in the Mekong River region, organised by Council of Renewable Energy (CORE) in the Mekong Region, 8-10 March 2000, Bangkok.
24. New and Renewable energy development and utilisation for global environment protrction, 22-23 November 1999, Bangkok, Seminar organised by DEDP, Thailand and NEF, Japan.
25. Invited lecture, UNEP Advanced Training Course on Cleaner Production in Pulp & Paper Mills, Kanchanapuri, Thailand, May 1998.
