1. Three months among the Fisherman Community of Moheshkhali Island in Bangladesh (1998-99) (BSS Research Monograph in Anthropology), Department of Anthropology, University of Dhaka.
2. Six months among the Fisherman Community of Moheshkhali Island in Bangladesh (1998-99) (MSS thesis in Anthropology), Department of Anthropology, University of Dhaka.
3. 14 months on the Traditional Environmental Knowledge (TEK) and Indigenous Environmental Knowledge of the Marine Fisheries in Bangladesh (ECOMAC) (2000-2001).
4. 6 months on Rakhain Housing Technology in coastal areas of Bangladesh (International Voluntary Service or IVS) (2002).
5. 8 months on Traditional Rural Adjudication System, (locally called SALISH) of rural Bangladesh (Chittagong University Research Cell or CURC) (2003).
6. PhD Dissertation research on the Khumi of the Chittagong Hill Tracts from October, 2004 to March 2008 (Kyoto University, Japan). Ethnographic fieldwork has been carried out 12 months in between Nov. 2005 and April 2007.
7. An intensive study on “Malaise of Modernity: Transition in Social Fabrics of Bangladesh” since April, 2008 to June 2009.
8. Archival research as Post-Doc fellow on the “Colonial (re)presentation of colonised people: a case study of Chittagong Hill Tracts”, the University of Hull, UK (June-September, 2009).
9. Eight months field visit in three phases to Teknaf and Ukhin of Cox’s Bazar to understand the plight of stateless Rohingya Refugees in Bangladesh in between 2008 and 2012.
10. Four months in four phases for ongoing research on “State in Everyday Life: Understanding the Paradox of Peace in Post-peace Accord Situation in the Chittagong Hill Tracts of Bangladesh.” since October 2011 to date.
11. Fieldwork is ongoing among the Rohingya people in Ukhia and Teknaf since 2012. Recently fieldwork-involvement started from 2017 is part a new research project funded by P4P Grant, SOAS, University of London.