Theoretical Chemistry, Chemical Physics, Atomic and Molecular Physics.
- D.Phil. (Oxon.) in Mathematics (Research Supervisor: Late Professor C. A. Coulson)
- Dip. Adv. Math. (Oxon.) with specialization in Quantum Theory
- M.Sc. (Cal.) in Pure Chemistry with specialization in Physical Chemistry
- CSIR Pool-Officer, Indian Association for Cultivation of Science, Kolkata (1969-70)
- Lecturer in Chemistry, IIT, Bombay (1970-71)
- Assistant Professor in Chemistry, BITS, Pilani, Rajasthan (1971-72)
- Lecturer in Chemistry, IIT, Bombay (1972-73)
- Assistant Professor in Chemistry, IIT, Bombay (1973-78)
- Professor in Chemistry, IIT, Bombay (1978-84)
- Professor of Theoretical Chemistry, Panjab University (1984-2004)
- ISRO Vikram Sarabhai Research Professor (JNCASR, Bangalore) at SNBNCBS, Kolkata (2004-07)
- Professor, Indian Institute of Science Education and Research, Kolkata (2007 -)
Awards and Honors:
- Commonwealth Scholar in Mathematics at Oxford University, U.K. (1965-68)
- Shanti Swarup Bhatnagar Award in Chemical Sciences (CSIR) (1981)
- Fellow, Indian Academy of Sciences, Bangalore (1984)
- Fellow, Indian National Science Academy, New Delhi (1987)
- Sir C.V. Raman Award in Physical Sciences (UGC) (1988)
- Guest Scholar, Faculty of Engineering, Kyoto University, Japan, (1989)
- Honorary Professor, Jawaharlal Nehru Centre for Advanced Scientific Research (1992-2004)
- Biennial Professor S.R. Palit Memorial Award in Chemistry, IACS, Kolkata (1994-95)
- Federation of Indian Chambers of Commerce and Industry (FICCI) Award in Physical Sciences including Mathematics (1996)
- Linus Pauling Memorial Lecture, Mahatma Gandhi University, Kottayam (1996)
- INSA Professor Sadhan Basu Memorial Lecture (1999)
- Chemical Research Society of India Silver Medal (2000)
- Prof. R.P. Mitra Memorial Lecture, Delhi University (2000)
- A.V. Rama Rao Foundation Lecture, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore (2003)
- Fellow, Academy of Sciences for the Developing World (TWAS), (2003)
- Fellow, International Union of Pure & Applied Chemistry (2010).
- Viscosity of liquids (with S.R. Palit), J. Indian Chem. Soc., 42, 571-572 (1965).
- The wonder that is laser, Science Reporter, 2, 326-331 (1965).
- Temperature (with S.R. Palit), Science Reporter, 3, 108-111 (1966).