- December 1980-March 1982: Production Supervisor, Ranbaxy Labs, Okhla, New Delhi.
- March 1982 - September 1984: Assistant Manager, Manufacturing, Alembic Chemical Work, Baroda, India.
- July 1989 - September 1993: Group Leader, Drug Targeting, SynPhar Labs, Inc., Edmonton, Alta, Canada.
- September 1993 – August 1997: Assistant Professor, Florida A&M University, College of Pharmacy, Tallahassee, FL, USA.
- September 1997-August 2002 : Associate Professor, Florida A&M University, College of Pharmacy, Tallahassee, FL, USA.
- September 2002-to date: Professor, Florida A&M University, College of Pharmacy, Tallahassee, FL, USA.