Research Associate at Brooklyn Polytechnic, New York USA from 1979 to 1981
Research Associate at Stanford University, California, USA from 1981 to 1982
Scientist at CSIR-IICT, Hyderabad India from 1982 to 2011
Visiting fellow at University College of Swansea, UK during 1991 to 1992
Visiting Scientist at Washington University, St. Louis, from 2001 to 2002
Director, Institute of Pesticide formulation at Gurgaon, Haryana, India during 2007 to 2009 on lien from CSIR-IICT.
Dean, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu, India
