1. 2009 (March) onwards: Professor, Dept. of Zoology, Visva-Bharati University.
2. Institute of Ecology, University of Georgia, Athens, Georgia 30602, USA. Worked with Prof.
Eugene. P. Odum, Prof. Barnard. C. Patten, Prof. Peter. Varity and Prof. Robert. E. Ulanowicz.
3. Section of Environmental Chemistry, Royal Danish School of Pharmacy, Copenhagen, Denmark
(Worked with Prof. Sven Erik Jorgensen).
4. Department of Theoretical Biology, Czech Academy of Science, University of South Bohemia, Czech Republic (Worked with Prof. Milan Straskraba).
5. Assistant Professor (Adjunct faculty) Department of Biology, University of South Bohemia
(Jhioceska Univerzita), Czech Republic.
6. Post-doctoral researcher, Department of Marine Science, Calcutta University, India, and partly
at the Department of Mathematics, Jadavpur University, Calcutta.
7. Ph.D. researcher at the Department of Marine Science, Calcutta University, India.