third, at Photonics Institute of Technical University of Vienna in 2004 and 2013, and the fourth, fifth and sixth at Hanyang University, South Korea in 2013, 2014 and 2015 and the last stint at Korea Advanced Institute of Science and Technology (KAIST) in 2016. Agarwal is married to Dr. Rashmi A. Agarwal and the couple has two children, Aditya (b. 2003) and Rithwik (b. 2006). The family lives in Kanpur in Uttar Pradesh. Legacy Agrawal's researches has covered the fields of engine combustion, alternate fuels, emission and particulate control, optical diagnosis, Methanol Engine Development, fuel spray optimization and tribology and his work has assisted in the development of low-cost diesel oxidation catalysts and homogeneous charge compression ignition engines. His studies of laser ignition of methane-air hydrogen-air mixtures and biodiesel based on Indian feedstocks have widened the understanding of the subjects; he carried out a project on biodiesels during 2010–13 for the Department of Science and Technology of India. He has documented his researches by way of over 280 articles; Google Scholar and ResearchGate, online repositories of scientific articles, have listed many of them. Besides, he has edited forty books, most of which are published by Springer, including, Combustion for Power Generation and Transportation, and Novel Combustion Concepts for Sustainable Energy Development and has contributed forty two chapters to many books. He is also a co-editor of a five-volume reference text, Handbook of Combustion, published by Wiley-VCH in 2010. Agarwal is the Associate Principle Editor of Journal "Fuel", Editor-in-chief of Journal of Energy and Environmental Sustainability (JEES) and is Associate Editor of two other journals, "ASME Journal of Energy Resources Technology", and "Journal of the Institution of Engineers (India): Series C". He is a member of the editorial board of several prestigious journals such as "International Journal of Engine Research, published by SAE International and IMechE, London, UK", Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering and Recent Patents on Mechanical Engineering of Bentham Science. He is also a former associate editor of the International Journal of Vehicle Systems Modelling and Testing of Inderscience Publishers, "International Journal of Oil, Gas and Coal Technology" (IJOGCT), Published by Inderscience Publishers and guest-edited a special issue of the Journal of Automobile Engineering on Alternative Fuels in 2007. He is a member of the Methanol Task Force of the Department of Science and Technology since 2017, former member of Technology