Putla Sudarsanam is a Scientist at the Catalysis and Inorganic Chemistry Division, CSIR National Chemical Laboratory (CSIR-NCL), Pune, India. He obtained his Ph.D. degree in Chemistry (2015) from the CSIR-Indian Institute of Chemical Technology (Hyderabad, India). Before joining CSIR-NCL, he worked as a post-doctoral fellow at KU Leuven (Belgium, 2017-2019), Leibniz Institute for Catalysis (LIKAT, Germany, 2017), and RMIT University (Australia, 2014-2016). His research focuses on developing advanced heterogeneous nanosized and singleatom catalysts for CO2 upgrading, syngas conversion, fine chemicals synthesis, and biomass valorization. Lakhveer Singh works in the Department of Environmental Science at SRM-University Amaravati. He previously worked as an Associate Professor at University Malaysia Pahang, Malaysia and as post-doctoral researcher at Oregon State University after obtaining his PhD from University Malaysia Pahang, Malaysia in 2013. Singh has developed and upscaled a hybrid bioelectrochemical system that contains highly efficient bacteria and novel cloth electrode assemblies with low-cost cathodes for hydrogen production from wastewater and lignocellulosic biomass. He has patented three ideas, edited seven books, published over 70 scientific papers, and published 15 book chapters. He is a member of various scientific communities, including International Water Association (IWA) and Asian Council of Science Editors (ACSE).