He received PhD in natural resources management and conservation from the Asian Institute of Technology (AIT) in Thailand. He was a Research Fellow at the Institute of Geography, Freie University Berlin in 1995, a Fulbright Visiting Scholar affiliated with University of Hawaii and the East-West Center in 2005, and a Visiting Researcher at AIT in 2009. He has been active in the area of protected areas, biodiversity conservation, landscape ecology and GIS for over 15 years and has been a frequent contributor to several international agencies (e.g., ITTO, IUCN, ADB, CIDA, DANCED/DANIDA, WWF). His current research involves biodiversity conservation and climate change. In addition, he has published a number of peer-reviewed papers and book chapters on these subjects.