1. ITU – Geneva for Regional African Satellite Communication Definition (1989-90)

  2. INMARSAT/ICO-UK on LEOSAT Definition Project-21& development of Mobile satellite Handheld Antenna (1993-96)

  3. Indo-UK REC Project at MREC Jaipur (1998)

  4. Ministry of Information Technology, Govt. of India (Chairman, Working group on Information Infrastructure 2000-2002)

  5. Reviewer of various projects of DRDO,DIT

  6. Gave courses on Advanced Communications at Indian Institute of Science, under Proficiency  Porgramme (1999, 2000,2001,2002,2003)

  7. Distinguished Visiting Professor of INAE (2003 to 2006)

  8. On the  GNSS Expert Panel of UN Office of Outer Space, Vienna

  9. Distinguished Lecturer, IEEE-AES Society, USA

  10. Vikram Sarabhai Memorial Lecture: GNSS – A Vast System of Systems, IETE Mid Term Symposium – 2007

  11. Co-convener, International Radar Symposium IRSI-2005,2007,2009

  12. Organizing Chair, International Microwave Symposium, ISM-2004, 2010

  13. Convener of International Seminar on Measurements and Robotics 2009

  14. Prof.Satish Dhawan Memorial Lecture-2009 for Aeronautical Society of India

  15. Member of a high level national team headed by Dr. V K Atre, former Scientific Advisor to Minister of Defense to look into the status of India AWACS programme and suggest midcourse correction.