* Professor (September 2006-present), Department of Biotechnology, Indian Institute of Technology Madras, Chennai
* Scientist (December 1997- August 2006), Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram
* Project Investigator (August 1995- June 1997), MD Anderson Cancer Center, Houston, USA
* Postdoctoral Fellow (August 1992- July 1995), Weizmann Institute of Science, Israel
* Lecturer (August 1979- June 1986) and Senior Lecturer in Biochemistry (July 1986- July 1992), PSG College of Arts and Science, Coimbatore