• Hoechst Research Center, Mumbai, India (1983 – 1985)
  • National Chemical Laboratory, Pune, India (1991 – 1992) as Fellow Scientist
  • University of California, Santa Cruz, USA (1992 – 1993) as Post-Doctoral Fellow (Prof. R. Braslau)
  • University of Konstanz, Germany (1993 – 1995) as Post-Doctoral Fellow, (Prof. R. R. Schmidt)
  • Indian Institute of Technology Madras (1995 –present); Head, Chemistry Department, (2015 – 2018)
  • Synthetic Carbohydrate Chemistry; Synthesis of Biologically/Medicinally Important Compounds; Developing New Building Blocks based on Weinreb-amide Functionality; Developing Enantiopure Chiral Building Blocks.