• Lectures at the University of Illinois, Urbana-Champaign, USA as LSA Fellow, 1978
  • Visiting Lecturer, Univ of Chittagong, Bangladesh, 1980; Also at Khulna and Sylhet
  • Lectures at the World Congress of Linguistics with a Permanent International Committee of
  • Delivered lectures as Visiting Professor, Indian Institute of Advanced Study, Shimla, 1989
  • Special lecture at the Asian Institute, Islamabad; January, 1999
  • Plenary Lecture at the 7th Himalayan Languages Symposium, Uppsala; Sweden, 2001
  • Visiting Faculty, University of Uppsala for SASNET-SIDA Project on Himachal Pradesh languages, Sweden; 2003
  • Plenary Talk, Inaugural Seminar, Asia Research Institute, Singapore; 2003
  • Lecture at the International Seminar on Central Peripheries, Peripheral Centers, University of Saarbrucken, Germany; 2004, UNESCO Lecture, Bangkok, Thailand; 2005;
  • Prof. S.K.Chatterji Memorial lectures; Indira Gandhi National Centre for the Arts (IGNCA), New Delhi; October 2008;
  • 5th Gargi Gupta Memorial Lecture at the French Embassy & Bharatiya Anuvad Parishad, Delhi, 12th Nov 12, 2009;
  • Plenary Talk, 18th European Conference on South Asian Studies, Univ of Lund, Sweden, 2005;
  • Inaugural Plenary, 14th World Pragmatics Congress, University of Goteborg, Sweden, 2008
  • Special lecture at the United Nations on the occasion of International Year of Languages, December 2008