* Professor, Dept of Biotechnology, IIT Madras, Chennai (19th May 2006-present)
* Associate Professor, Dept of Biotechnology, IIT Madras, Chennai (15th Apr 2004-18th May 2006)
* Faculty at Centre for Biotechnology, Anna University, Chennai (July 2003-Mar 2004)
* Program Leader, Chemical engineering modelling group, GE India Technology centre, Bangalore (Jan 2000 - Jun, 2003 )
* Group Manager, ICI India R&T centre , Bombay (Sept, 1989-Dec, 1999)
* Senior Scientist, ICI India R&T centre , Bombay (Sept, 1983-Dec, 1988)