·         Professor, Department of Soil, Water and Environment, Dhaka University, since August 25, 1992.

·         Associate Professor, Department of Soil Science, Dhaka University, Jan. 7 1987 to Aug. 24, 1992. 

·         Assistant Professor, Department of Soil Science, Dhaka University, Dec. 1 1977 to Jan. 6, 1987. 

·         'Assistant Associe' (Associate Professor) in Plant Physiology at the University of Nancy I, France, Oct. 1 to Dec 31, 1983. 

·         Lecturer in Soil Science, Dhaka University, Nov. 19 1973 to Dec.6, 1977. 

·         Post-doctoral fellow, Plant Physiology laboratory, University of Nancy I, France, July 1 to Dec. 14, 1984. 

·         Part-time teacher in French Language at the Institute of Modern Languages (IML), Dhaka University, since November 1986 till date. 

·         Principal Investigator of a BARC coordinated and World Bank financed research project on 'The evaluation of the production potentials of the coastal saline soils of Bangladesh' (1986 to 1992). 

·         Part-time consultant on Soil Science and Agronomy for one year in Bottomline Co., a consulting farm at Dhaka. (CHT rehabilitation program). 

·         Part-time consultant on Agronomy for EIP of BWDB (six months) (Agronomic feasibility study in the Shakpaldia Drainage and Flood control project). 

·         Worked as consultant of FAO (1986) in Bangladesh (Accelerated cereal production in Bangladesh and Conservation based land use practices in Bangladesh). 

·         Part-time consultant in the Soil Testing, Management and Development of SRDI for 2 man months (December 1998). 

·         Part-time consultant for Waste Concern during July-December, 2001 on Soil Science for component 3.3.2 of SEMP, entitled Community Based Urban Solid Waste Management in Dhaka funded by UNDP.

·         JSPS Post Doctoral Visiting Fellow in Japan, 09August-09 October, 2003. 

·         Project director, ACIAR sponsored research project on "Arsenic Transfer in Water-soil-crop Environment of Bangladesh and Australia", 2000-2006.

·        Team Leader- Atlas on Bio-ecological zones of Bangladesh - a consultancy work with IUCN, Bangladesh, Jan.-Sept. 2000.

·       Team Leader, an IUCN project on the preparation of an Atlas on Biozones (Delineation of zones on biodiversity) of Bangladesh, February-December, 2000. 

·       Dean (acting),Faculty of Bioolgical Sciences, Dhaka University. 

·         Provost, Shahidullah Hall, Dhaka University, from August 16, 1996 to March 01,2002. 

·         House Tutor, Shahidullah Hall, Dhaka University, August, 1988 to June. 1993. 

·         Assistant House Tutor of the same hall from July, 1985 to July, 1988. 

·         Assistant House Tutor, F.H. Hall, Dhaka University, Sept. 1976 to January 1979. 

·         Founder Director, Bangladesh-Australia Centre for Environmental Research 

·         Chairman, Department of Soil, Water and Environment, University of Dhaka, August 18, 2005 to August 17, 2008.

     Chairman, Bangladesh Council of Scientific and Industrial Research, Dhaka, August 09 2009 to August 08, 2011.

 

      OTHER ACTIVITIES

·         Editor, DU Journal of Biological Sciences, 2005-2007.

·         President, Soil Science Society of Bangladesh, 2005-2007, 2008-2010.

·         Executive Director, SWED-DU Trust, 2003-2005

·         Chairman, SWED-DU Trust, 2005-2008

·       President, Bangladesh Association for the Advancement of Science (BAAS), 2007-2009,2009-2011.

·         President, West End High School Alumni Association, 2006-2008, 2008-2010.

·         Senator, Dhaka University, 1994-1997, 1997-2000.

·         Member, consultative committee, Ministry of Science and Technology,

·         Government of the People's Republic of Bangladesh.

       Chairman of the Governing Body of Abu Zar Giffary College, Dhaka,  27 April 2011-26 April 2014.

·         Chairman, Governing Body, Bangladesh Homeopathic Medical College, Dhaka, 1996-1998, 1998-2000.

·         Vice-chairman, Managing Committee, Udyan School, Dhaka, 1997-98.           

·         Member, Governing body, Govt. Homeopathic Medical College, Dhaka, 1998-99.

·         Member, Governing body, City Dental College, Dhaka.

·         Elected Vice president, Dhaka University Club, 1997-98.

·       Elected President, Bangladesh Biggani Samity (Bangladesh Association of Scientists), 2000-2002. 

·         Elected Vice president (acting President), Bangladesh Biggani Samity (Bangladesh Association of Scientists), 1998-2000.

·         Member, Executive Committee, Franco-Bangladesh Association of Scholars and Trainees, 1994, 1995, 1996, 2005, 2006.

·         Elected member to the Executive Committee of the Dhaka University Teachers' Association for the years 1977-78, 1994, 1996, 1997 and 1998.

·         Elected General Secretary, Dhaka University Teachers' Association for the year    1995.  

·         Elected Joint-Secretary of the Dhaka University Teachers' Association, 1989.

·         Secretary General, Soil Science Society of Bangladesh, 1993-1997.

·         Organizing Secretary, International Conference of Commission IV of the International Society of Soil Sciences, held at Dhaka, December 1-3, 1992.

·         Member of the International Scientific Committee of the 8th ICOBTE (International Conference on Biogeochemistry of Trace Elements) held in Adelaide, Australia during April 2005.

·         Treasurer, Soil Science Society of Bangladesh, 1990-1991.

·         Member of the Executive Committee of the SSSB, 1991-1993, 1997-1999, 2002 - 2005.

·         Treasurer, Bangladesh Association for the Advancement of Science (BAAS), 1996 – 1999.

·         Elected General Secretary of section I of BAAS for 1986-1987.

·         Member, Expert Committee on Earth Sciences of the Encyclopedia of

·         Bangladesh (Banglapedia) project of the Asiatic Society of Bangladesh.

·         Associate Editor, Bangladesh Journal of Scientific Research, 1992-1994.

·         Associate Editor, Bangladesh Journal of Soil Science, 1990-1991 and 1997-1999.

·         Editor,"Samachar" - Bengali trimestral magazine of BAAS.

·         Executive Editor, "Edaphos"- the popular magazine of the Ex-students' Association of Dhaka University Soil Science Department.

·         Member, Editorial Board: Soil Science Bulletin No.1: Proceedings of the lectures delivered on the 40th Anniversary celebration of the Soil Science Department, University of Dhaka.

·       Member, Editorial Board, Bangladesh Journal of Soil Science 1993-1995, 1995-1997, 2002-2005.

·         Member, Editorial Board, Dhaka University Journal (Bengali part), 2001-2003.

·       Member, Editorial board, The Dhaka University Journal of Biological Sciences,2005-2007.

·       Advisor on Environment to the "COMMITMENT" - a socio-cultural NGO located at Dhaka.

·         Elected member to the Governing body (1993-1995) of the D.U. Laboratory School and College, Dhaka.

·         Member of the Academic Council, Dhaka University.

·         Zone Chairman, Lions Club District 315B-2 (Zone -4, 1997-98, Zone –2, 1998-99).

·         Region Chairman, Lions Club International, District 315B-2, 2004-2005.

·         President, Lion's Club of Dhaka Motijheel, District 315B-2, 1995-1996.

·   Representative to the General Assembly of AIT  Students' Union, Bangkok,Thailand,1980. 

·         Edited and published books like: (a) "Buro Dadur Golpo"(The stories   of Grandpa)- an  autobiography-cum-story book; (b) A book on  the life and activities of Prof. A. Q. M. B. Karim, Ex-Chairman, PSC, Bangladesh ;(c) "Anuddheya", a book on comparative philosophy (d)"Ziqr“ a religious book on meditation.

·         Member: International Union of Societies of Soil Sciences, Japanese Society of Soil Science and Plant Nutrition, Soil Science Society of Bangladesh (Life member), Bangladesh Botanical Society (Life Member), Bangladesh Society of Microbiology (Life Member), Bangladesh Association for the Advancement of Science (Life member), Bangla Academy (Life Member), Asiatic Society of Bangladesh (Life Member), Alumni Association of AIT (Life member), French Bangladesh Association of Scholars and Trainees  (Life Member), Dhaka University Alumni Association (Life Member).