* Associate Professor, Department of Biotechnology, Indian Institute of Technology Madras, Chennai(May 2007- present).
* Staff Scientist-V, Centre DNA Fingerprinting and Diagnostics, Hyderabad(May 2005 – May 2007).
* Visiting Scientist, Institute of Molecular and Cellular Biology, Singapore(Aug-Dec. 2003).
* Visiting Scientist, University of Pittsburgh, Pittsburgh, USA(March-May 2002).
* Staff Scientist-IV, Centre DNA Fingerprinting and Diagnostics, Hyderabad(Oct 2000-April 2005).
* Research Associate, University of Alabama, Birmingham, USA(1997-00).
* Research Associate, University of Pennsylvania, Philadelphia, USA(1996-97).
* Postdoctoral Fellow, Thomas Jefferson Univ, Philadelphia, USA(1994-95).