Presently Professor, Indian Institute of Science Education and Research (IISER), Kolkata.
2013- Associate Professor, Indian Institute of Science Education and Research (IISER), Kolkata.
2008 - 2012 : Assistant Professor, Indian Institute of Science Education and Research (IISER), Kolkata.
2006 - 2008 : Senior post doctoral researcher at Univ. of Kansas, Lawrence, KS, USA.
2004 - 2006 : Post doctoral researcher at Univ. of California, Los Angeles, CA, USA.
2001 - 2004 : Visiting Scientist at Univ. of New Brunswick, Fredericton, NB, Canada.
2000 - 2001 : Visiting Scholar at Univ. of Kansas, Lawrence, KS, USA.
1999 - 2000 : Post doctoral position at Univ. of New Brunswick, Fredericton, NB, Canada.
1998 - 1999 : Research Associateship from CSIR, New Delhi and JNCASR, Bangalore.