Rohan Gunaratna is a Sri Lankan researcher on terrorism.
Gunaratna is the head of the International Center for Political Violence and Terrorism Research at Nanyang Technological University in Singapore. He is a Senior Fellow at the Jebsen Center for Counter Terrorism Studies, Fletcher School for Law and Diplomacy and an Honorary Fellow at the International Policy Institute for Counter Terrorism in Israel. He has served as a consultant to the United Kingdom and United States law enforcement communities.
Source -Wikipedia http://en.wikipedia.org/wiki/Rohan_Gunaratna