International Symposium of Silvicultural Technologies, Tsukuba,Japan,1978. Paper Presenter.

World Forestry Congress, Jakarta, Indonesia,1978. Participant.

Seminar of Forestry Research Development, JICA-Thailand Royal Forestry Department, Bangkok, 1988. Paper Presenter.

The Fourth Round Table Conference on Dipterocarps, Bogor, Indonesia, 1989. Paper Presenter.

Seminar of Integration Management of Tropical Rain Forest Into Regional Development, Kuala Lumpur Malaysia, 1990. Paper Presenter.

International Union Forestry Research Organization (IUFRO) Conference, Montreal Canada,1990. Voluntary Paper Submitted & Participant.

Asian Regional Conference of Environmental Education for Sustainable Development, Jakarta, Indonesia, 1993. Participant.

International Conference on Soils of Tropical Forest Ecosystems, International Soil Science Society- CIFOR-GTZ, Balikpapan, Indonesia,1995. Paper Submitted.

Seminar Workshop on The Mechanisms for Technology Transfer and Development in the BIMP-EAGA, Davao City, Philippines,1997. Paper Presenter.

The Third International Conference on Zero Emissions, Jakarta, Indonesia,1997. Participant.

The Third International Symposium on Asian Tropical Forest Management, JICA-UNIVERSITY OF MULAWARMAN,1999. Paper Submitted.

Comparative Study of Teak Plantation Management in Thailand, Chiang May Bangkok, Thailand's Department of Forestry , 2001. Participant.

Member of Indonesian Delegation in the XXXII Session of International Timber Trade Council (ITTC), Bali, Indonesia, 2002.

Member of Steering Committee, Joint Biodiversity Expedition Malaysia in Kayan Mentarang National Park, WWF-Indonesia , 2003.

Member of Steering Committee ITTO Research in Forest Fire, East Kalimantan, 2001/2002.

Member of Steering Committee, CIFOR-DFID-FORDA,IRD,ITTO Research: Sustainable Collaborative Forest Management in Bulungan, Model Forest, 2004.

Member of Steering Committee, Tropenbos International - Ministry of Forestry: Tropical Rain Forest Research in Indonesia, 2004.

Internal Workshop of the Ministry of Forestry of Indonesia-Tropenbos International Kalimantan Programme, Leiden University, Netherlands, 2004. Paper Presenter.

Meeting of Alternative Cooperation in Education, Research and Training between Faculty of Forestry University Putra Malaysia and Faculty of Forestry, Mulawarman University, Serdang, Malaysia, 2004. Paper Presenter.

Scientific Coordinator, Tropenbos International Kalimantan Programme Ministry of Forest , Indonesia, 2004-2005. Internal Workshop of the Ministry of Forestry of Indonesia-Tropenbos International Kalimantan Programme, Leiden University, Netherlands, 2006. Paper Presenter.

The 7th International Flora Malesiana Symposium, Leiden, Netherlands, 2007. Participant.

The 14th Meeting of the Conference of the parties of CITES (Convention on International Trade in Endanger Species of Wild Fauna and Flora), The Hague, Netherlands. 2007. Participant.

Seminar of Strengthening Investment Opportunities for Better Tomorrow. Indonesia’s Integrated Investment Promotion 2007 in Seoul, South Korea. The Investment Coordinating Board Republic of Indonesia, 2007. Participant.

Meeting of Research Findinds in Medicinal Plants. Department of Biotechnology, Yonsei University, Seoul, South Korea, 2007. Power Point Presenter.

Internal Workshop of the Ministry of Forestry of Indonesia-Tropenbos International Kalimantan Programme, Leiden University, Netherlands, 2007. Paper Presenter.

Meeting of Alternative Collaboration in Education and Research between Asian Institute of Technology and Mulawarman University, Bangkok, Thailand, 2008. Participant.

Member of Steering Committee on the National Dugong Conservation Strategy. Collaboration of UNEP-Netherlands-Indonesia, 2007-2008.

International Conference on International Collaboration in Handling Global Crisis. Pontianak, Indonesia, 2009. Paper submitted and Participant.

Workshop on Ecological Change, Human Adaptation and Governance in East Kalimantan’s Waterways. Radboud University, Nijmegen, The Netherlands. 2009. Paper Presenter.

Workshop The Challenges of International Education in Agricultural Sciences for Developing Countries at The Tokyo University, Tokyo, Japan, March, 29, 2010. Paper Presenter.

International Seminar for Research Higher Degree. Collaboration of Newcastle University, Australia and Mulawarman University, Samarinda, 2011. Moderator.

Indonesian Higher Education Expo in Amman, Jordan, 2011. Participant and Presenter.

Meeting for International Collaboration with World Islamic Science and Education University, Amman, Jordan. 2011. Participant and Presenter.

Examination of PhD Students in Leiden University, The Netherlands. 2011. Co-Promotor.

International Seminar : Strengthening Teaching and Learning System at Higher Education: Challenges and Opportunities. Tadulako University, Palu. February, 2012. Participant.

International Seminar on Enhancing Internationalization of Higher Education in Indonesia. Samratulangi University, Manado. June, 2012. Participant.

International Workshop : Disaster Risk Reduction and Climate Change Adaptation n The Perspective of Education for Sustainable Development : Challenges and Opportunities in The Asia Pacific Region. Institute of Advanced Studies, United Nations University-RCE. Balikpapan. Participant and Speaker.

International Seminar : Managing Higher Education Quality Assurance Systems to Improve Higher Education Institution Performance. HELM-USAID, Jakarta, September, 2012. Participant.

International Seminar : Strengthening cooperation among Eastern Indonesia Universities. Tadulako University-Deakin University, Australia, Palu. October 2012. Participant.

Asia Total Education Center Environment Seminar. Balikpapan, October, 2012. Participant.

International Tropical Course on Rainforest and Marine Diversity. University of Mulawarman. Samarinda, November 2012. Course Director and Keynote Speaker.

Training Course on Writing of Scientific Articles for International Journals. University of Mulawarman, Samarinda, December, 2012. Trainer and Steering Committee.

Kustiawan, W. 2011. University of Mulawarman and Potential of Collaboration with Mara Institute of Technology. Power Point Presentation at University of Technology, Mara, Malaysia.

Kustiawan, W. 2011. University of Mulawarman and Potential of Collaboration with University of Tokyo. Power Point Presentation at University of Tokyo, Japan.

Kustiawan, W. 2011. University of Mulawarman and Potential of Collaboration with University of Aichi. Power Point Presentation at University of Aichi, Japan.

Kustiawan, W. 2011. University of Mulawarman and Potential of Collaboration with University of Chiba. Power Point Presentation at University of Chiba, Japan.

Kustiawan, W. 2012. University of Mulawarman and Potential for Collaboration with University of Adelaide. Power Point Presentation at University of Adelaide, Australia.

Kustiawan, W. 2012. University of Mulawarman and Potential for Collaboration with University of Canberra Power Point Presentation at University of Canberra, Australia.

Kustiawan, W. 2012. University of Mulawarman and Potential of Collaboration with University of Kassel. Power Point Presentation at University of Kassel, Germany.

Kustiawan, W. 2012. University of Mulawarman and Potential of Collaboration with University of Gottingen. Power Point Presentation at University of Gottingen, Germany.

Kustiawan, W. 2012. University of Mulawarman and Potential of Collaboration with Lille University of Sciences and Technology. Power Point Presentation at Lille University of Science and Technology, France.

Kustiawan, W. 2012. University of Mulawarman and Potential of Collaboration with University of Leiden. Power Point Presentation at University of Leiden, The Netherlands.

Kustiawan, W. 2013. University of Mulawarman and Potential of Collaboration with Flinders University. Power Point Presentation at Flinders University, Australia.

Kustiawan, W. 2013. University of Mulawarman and Potential of Collaboration with University of Melbourne. Power Point Presentation at University of Melbourne, Australia.