Visits
- June - July 2001, Cytel Pvt. Ltd., Boston, USA.
- 18th June - 3rd July 2005, Indian Statistical Institute, Kolkata.
- 1st September 2008 - 30th April 2009, Department of Statistics, University of Michigan, Ann Arbor, USA.
- 21st March - 26th March 2011, Indian Statistical Institute, Kolkata.