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ITU – Geneva for Regional African Satellite Communication Definition (1989-90)
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INMARSAT/ICO-UK on LEOSAT Definition Project-21& development of Mobile satellite Handheld Antenna (1993-96)
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Indo-UK REC Project at MREC Jaipur (1998)
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Ministry of Information Technology, Govt. of India (Chairman, Working group on Information Infrastructure 2000-2002)
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Reviewer of various projects of DRDO,DIT
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Gave courses on Advanced Communications at Indian Institute of Science, under Proficiency Porgramme (1999, 2000,2001,2002,2003)
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Distinguished Visiting Professor of INAE (2003 to 2006)
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On the GNSS Expert Panel of UN Office of Outer Space, Vienna
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Distinguished Lecturer, IEEE-AES Society, USA
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Vikram Sarabhai Memorial Lecture: GNSS – A Vast System of Systems, IETE Mid Term Symposium – 2007
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Co-convener, International Radar Symposium IRSI-2005,2007,2009
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Organizing Chair, International Microwave Symposium, ISM-2004, 2010
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Convener of International Seminar on Measurements and Robotics 2009
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Prof.Satish Dhawan Memorial Lecture-2009 for Aeronautical Society of India
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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.