Awards
1) National Science Talent Search (NSTS) Scholarship in 1975.
2) National Science (NS) Scholarship in 1975.
4) Life Member: Indian Association of General Relativity and Gravitation.
5) Young Associate award from Indian Academy of Sciences (1990-1993).
6) Young Scientist award by the Indian National Science Academy (1990)
8) Member: International Astronomical Union (1991- )
9) A.K. Bose Award by Indian National Science Academy (1994)
10) INSA/DFG nomination to attend 44th Meeting of the Nobel Prize Winners in Lindau(1994)
11) Member: Executive Committee of Commission-28 (Galaxies) of International Astronomical Union (1994-2000)
12) Senior Research Associate (National Research Council, National Academy of Sciences) at NASA/Goddard Space Flight Centre (Oct.1994 - Oct.1995)
13) Member: American Astronomical Society (1996)
14) Sub-Editor (Astrophysics Section) of Indian Journal of Physics (1999- )
18) Member: American Astronomical Society (2007- 2008)
19) Member Editorial Board: Open Astronomy Journal (Bentham) (2007-)
20) Member: International Society of the Study of the Origin of Life (ISSOL) (2008- )
21) Member: Editorial board of ”Bulletin of Astronomical Society of India (BASI)” (2010-2016)
22) Guest Editor for PhD Thesis series: Springer Publishers, Germany (2012 - )
23) Recepient of ’Mitra Mandir’ Eminent Personalities of India medalion (2012) 24)Member, International Scientific Organizing Committee of ”International Conference on Astrophysics and Cosmology”, Kathmandu, July, 2012
25) Member, International Co-ordination Committee of ”13th Marcel Grossman Conference on General Relativity and Cosmology, Stockholm, July, 2012
26) Chairman, ”Accretion processes on Black Holes” at ”13th Marcel Grossman Conference on General Relativity and Cosmology, Stockholm, July, 2012
27) Scientific Organizers in Three sessions in 39th COSPAR 2012 General Assembly (C0.4, E1.2, F3.5), Mysore, July, 2012.
28) Banga Ratna (Jewel of Bengal) award by the Government of West Bengal Province of India in January, 2014
29) Scientific Organizer of 40th COSPAR 2014 General Assembly (C0.4), Moscow (August 2014)
30) Scientific Organizer of Three sessions of 41st COSPAR 2016 General Assembly Istanbul (August 2016; cancelled due to unrest)
31) Scientific Organizer of Four sessions of 42th COSPAR 2018 General Assembly Caltech, USA (August 2018, scheduled)
32) LOC and International Co-ordination Committee Member of MG14 held in Rome (July, 2015)
Others: Member of the Expert Committee on Astrophysics: Indira Gandhi National Open University; Expert member: Italian Space Agency Proposal Review/ESA proposal review; Invited Professor, University of Paris (two months), 2002; Member: Project Monitoring Body of RT-2 payloads (2005-2008); Team Leader: Balloon borne Science programme at Indian Centre for Space Physics
33) DSc (Honoris Causa): from Gour Banga University (2015)
34) One of Top-ten physicists in India, India Today (http://indiatoday.intoday.in/education/story/top10-indian physicists/1/443853.html)