He has been chairperson of the Centre for International Legal Studies at Jawaharlal Nehru University, New Delhi.
He had a 2+1⁄2-year stint as vice chancellor of the West Bengal National University of Juridical Sciences.
He served as a member of the Academic Advisory Committee of the Office of the United Nations High Commissioner for Refugees for the period from 1996 to 2000.
[5] He was Fellow in Nantes Institute for Advanced Study from October 2018 to March 2019 working on 'Pathways to the Future: International Law and Global Justice'.
In February 2010, he delivered lecture to the Asian–African Legal Consultative Organization (AALCO)Training Program: Basic Course on the World Trade Organization with his JNU's centre and school colleagues, such as Dr. V. G. Hegde, Dr. Archna Negi at AALCO Permanent Headquarters, New Delhi, India.