Positions Held:

1.        Research Associate, University College of Science, Calcutta, 1967-1969.

          Lecturer in Chemistry, Surendranath College (University of Calcutta), 1969-1970.

          Lecturer in Chemistry, T.D. Post-Graduate College (University of Gorakhpur), 1970-1976.

          Post-doctoral Research, (University of Dortmund, Germany), 1976-1977.

          Post-doctoral Research, (University of Bielefeld, Germany), 1977-1978).

          Lecturer in Chemistry, Indian Institute of Technology-Kanpur, 1978-1980.

          Visiting Scientist, Faculty of Chemistry, University of Bielefeld, Germany. 1981-1982.

          Visiting Scientist, Charles F. Kettering  Research Laboratory, Yellow Spring, Ohio, USA, ,May-July, 1984

          Assistant Professor of Chemistry, Indian Institute of Technology-Kanpur, 1981-1988.

          Visiting Assistant Professor of Chemistry, University of Charlottesville, Virginia, USA, 1988-1989.

          Professor of Chemistry, Indian Institute of Technology-Kanpur, 1988- continued.

          Humboldt-Fellow , University of Bielefeld, Germany (Dec. 1998- Feb.1999);

          Visiting Professor, Tata Institute of Fundamental Research, Mumbai (May-July, 2000);

          Visiting Professor, University of Karlsruhe, Germany (June-July, 2002).

          Chair, Department of Chemistry, IIT, Kanpur, ( January,2001-December,2004 )

         Member, Board of Directors, Cromoz Inc, .Raleigh, NC 27617, USA (September, 2004-contd.)

          Re-invited by Alexander von Humboldt Foundation, Germany, June-July, 2006

          Visiting Professor , Central University Hyderabad, India  ( January,2007)