Professor (Level 15 (HAG)), Department of Mathematics, IIT Guwahati: December 28, 2021 till present

Professor (Level 14A) , Department of Mathematics, IIT Guwahati: June 22, 2012 to December 27, 2021

Associate Professor, Department of Mathematics, IIT Guwahati. February 6, 2007 to June 21, 2012

Assistant Professor, Department of Mathematics, IIT Guwahati: July 9, 2001 to February 5, 2007

Senior Lecturer, Department of Mathematics, IIT Guwahati: January 18, 1999 to July 8, 2001 

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Research Assistant, Department of Engineering Mathematics, Technical University of Nova Scotia (now merged with Dalhouise University), Halifax, Canada:

September 1993 to December 1997

Teaching Assistant, Department of Engineering Mathematics, Technical University of Nova Scotia (now merged with Dalhouise University), Halifax, Canada:

September 1993 to December 1997

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Lecturer, Department of Mathematics, Bajali College, Pathsala, Assam, India: September 1992 to August 1993