In-Charge, Center for Soft Computing Research, Indian Statistical Institute, Kolkata from April 2010.
	Professor, Machine Intelligence Unit, Indian Statistical Institute, Kolkata from June 2005.
	Visiting Professor, Hannan University, Osaka, Japan during October-November, 2008.
	Visiting Professor, Yonsei University, Korea, December 2006-January, 2007.
	Associate Professor, Machine Intelligence Unit, Indian Statistical Institute, Calcutta during June 1998 to May 2005.

	Guest Faculty, Utkal University, Bhubaneswar, Orissa, India, 2000-2007.
	Guest Faculty, F. M. University, Balasore, India, 2007.
	Visiting Professor, Hannan University, Osaka, Japan during February-April, 2005.
	Visiting Professor, Hannan University, Osaka, Japan during September-October, 2004.
	Guest Faculty, Jadavpur University, Kolkata, India,  2004.
	Guest Faculty, Calcutta University, Kolkata, India,   2001-2004.
	Visiting Professor, University of California, Los Angeles, USA from October to December 2003.

	Guest Researcher, Warsaw University of Technology, Warsaw, Poland during March-April, 2000.
	Visiting Researcher, German National Research Center for Information Technology (GMD), St. Augustin, Germany during January-April, 2000 (on leave from the Machine Intelligence Unit, Indian Statistical Institute, Calcutta).
	Lecturer, Machine Intelligence Unit, Indian Statistical Institute, Calcutta (from May 1995 to May 1998).

Visiting Scholar, Hannan University, Osaka, Japan during September-October, 1997 (on leave from the Machine Intelligence Unit, Indian Statistical Institute, Calcutta).

Research Scientist, Department of Industrial Engineering, Osaka Prefecture  University, Osaka, Japan from October 1995 to March 1997 (on leave from the Machine Intelligence Unit, Indian Statistical Institute, Calcutta).

Computer Engineer, Machine Intelligence Unit, Indian Statistical Institute, Calcutta from December 1993 to May 1995.

Research Associate, Machine Intelligence Unit, Indian Statistical Institute, Calcutta from April 1993 to December 1993.

Senior Research Fellow, Electronics and Communication Sciences Unit,   Indian Statistical Institute, Calcutta from August 1989 to April 1993.

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