Arif Darmawan is a Researcher at the Agency for the Assessment and Application of Technology or BPPT (currently integrated into the National Research and Innovation Agency (BRIN)), Indonesia. He received his PhD degree in Transdisciplinary Science and Engineering from Tokyo Institute of Technology, Japan. His research interests include energy systems, process engineering, hydrogen production–storage–utilization, and biomass-to-energy, and he is dedicated to the study of energy sustainability. He has published over 28 publications in reputable scientific journals, book chapters, and conference proceedings.