Reader (Associate Professor), Department of Chemistry, University of Lucknow, Lucknow, India October 2000 till date
Exchange Visitor Fellow and Director of the Drug Discovery Core, Cystic Fibrosis Center, Department of Cell Biology and Physiology, University of Pittsburgh, Pittsburgh, PA 15261, USA From May 2001 to June 2004
SERC Visiting Fellow at Central Drug Research Institute, Lucknow From June 1, 2000 to August 31, 2000.
Lecturer (Assistant Professor), Department of Chemistry, University of Lucknow, Lucknow, India from 1991 till 2001.
Research Associate (CSIR), Medicinal Chemistry Division of Central Drug Research Institute (CDRI), Lucknow From January 1991 to October 1991.
Research Associate (ONR, USA), Medicinal Chemistry Division of Central Drug Research Institute (CDRI), Lucknow From May 1990 to December 1990.
Senior Research fellow (NIH, USA), Medicinal Chemistry Division of Central Drug Research Institute (CDRI), Lucknow From August 1987 to April 1990.
Junior Research fellow (NIH, USA), Medicinal Chemistry Division of Central Drug Research Institute (CDRI), Lucknow FromAugust 1985 to July 1987.