President, Indian National Science Academy, 1999 - 2001, Vice-President, 1995 - 97.

Member, Scientific Advisory Committee to the Prime Minister of India, 2004 -

Member, Scientific Advisory Committee to the Cabinet (SACC), Government of India, 1997 -

Member, Executive Board, International Council for Science (ICSU), 1999 - 2002.

President, International Council for Science (ICSU), 2005 -, President- Elect, 2002 - 2005.

Co-Chair (with Bruce Alberts, President, National Academy of Sciences, USA), Inter Academy Council (IAC), 2000 - 2005.

Member, Executive Committee, Inter Academy Panel (IAP), 2000 - 2001.

President, Association of Indian Universities (AIU), 2003.

President, Chemical Research Society of India (CRSI), 2002 - 2005.

Member, Science and Engineering Research Council (SERC), 1984 - 90, 1994 - 97.

Vice-President, Indian Academy of Sciences, 1992 - 94, Council 1989 - 94.

Member, Indian-European Union (EU) Round Table of Eminent Persons, 2000 - 2004.

Chairman and Member, University Grants Commission Panel on Chemistry, 1983 - 93.

Chairman, National Accreditation and Assessment Council (NAAC), 2006 -

Member, Government of India Scientific Commission on Bhopal Gas Leakage, 1985 - 87.

Chairman, National Committee for IUPAC, 1991 - 93 and Member, IUPAC Committees 1977 -

Member of numerous National Committees and Councils of DST, CSIR, UGC, DAE, DRDO, etc.

Trustee / Member of several Scientific Foundations, Juries and Award Bodies world-wide.