His earlier appointments include his appointment as honorary faculty for Air Law, National Institute of Aviation Management and Research (NIAMAR) under Airports Authority of India, New Delhi. He has also been visiting faculty for Environmental Law at the Centre for Environmental Law, WWF, New Delhi.
His rich experience as a researcher in International Law, especially in International Air and Space Law has made him a prolific writer. He has authored two books—International Transportation—Law of Carriage by Airas well as Outer Space: Security and Legal Challenges. He has also written a monograph titled Space Tourism—Industry of 21st Century, which has been published by the Foundation for Aviation and Sustainable Tourism (FAST), New Delhi, 1999.