Dr. Sudipta De is currently Professor, Mechanical Engineering Department, Jadavpur University, India. His area of interest is sustainable energy. He received his research funding from UGC, DST (India); EU; Swedish Research Council; DFG-Germany; SIU and DIKU-Norway etc. He is an editorial board member of the Springer Nature journal ‘Clean Technologies and Environmental Policy’. He received the Indian National Science Academy (INSA) Teacher Award, a lifetime award for distinguished contribution. He was the leader of the Indian Delegation in the 13th Plenary Meeting of ISO/TC 238: Solid Biofuels. He is elected Fellows of West Bengal Academy of Science and Technology and International Society for Energy, Environment and Sustainability. Prof. Avinash Kumar Agarwal joined IIT Kanpur in 2001. He worked as Post-Doctoral Fellow at the Engine Research Center, UW@Madison, USA (1999–2001). His interests are IC engines, combustion, alternate and conventional fuels, lubricating oil tribology, optical diagnostics, laser ignition, HCCI, emissions and particulate control, 1D and 3D simulations of engine processes, and large-bore engines. He has published 525+ peer-reviewed international journal and conference papers, 63 edited books, 129 chapters, 16200+ Scopus, and 24300+ Google Scholar citations. He is Editor of FUEL, Associated Editor of the SAE Journal of Engines, and the ASME Open Journal of Engineering. He is India’s number one Energy researcher in the recently declared Stanford University listing of the top 2% of researchers globally. Dr. Pankaj Kalita received his bachelor’s degree in mechanical engineering from the Jorhat Engineering College, (Under Dibrugarh University, Assam) and subsequently M.Tech. in Fluids and Thermal Engineering and Ph.D. degrees in clean coal technologies from the Indian Institute of Technology Guwahati. Currently, he is Associate Professor in the School of Energy Science and Engineering, Indian Institute of Technology Guwahati. He worked as Assistant Professor in the Department of Energy at Tezpur University, Assam, before joining at IIT Guwahati in 2015. He has more than 10 years of teaching experience and 16 years of research experience in the field of clean energy technologies. He has published more than 100 research articles in various reputed journals and conferences. So far, he has published 3 edited books and contributed 16 book chapters. He has completed several research and consultancy projects in the areas of clean energy technologies.