Dr Ram B. Gupta is a Distinguished Chair Professor and Chair of the Chemical Engineering Graduate Program at Auburn University. He has published numerous research papers and holds several patents on biofuels, nanotechnology, hydrogen fuel, and supercritical fluid technology and is the recipient of several national awards. He is a Fellow of the Alabama Academy of Science. He served on the editorial advisory boards of Industrial and Engineering Chemistry Research and Nanomedicine: Nanotechnology, Biology and Medicine and is currently serving on the editorial boards of the Journal of Biomedical Nanotechnology, Research Letters in Nanotechnology, the Open Nanomedicine Journal, the International Journal of Chemical Engineering, and Research Letters in Chemical Engineering. His recent books are Nanoparticle Technology for Drug Delivery; Solubility in Supercritical Carbon Dioxide; Hydrogen Fuel: Production, Transport, and Storage; and Gasoline, Diesel, and Ethanol Biofuels from Grasses and Plants. Ayhan Demirbas is a Full Professor at Sila Science and Energy. He was a Professor of Energy Technologies Science at Karadeniz Technical University, Turkey, between 1991 and 2001, and at Selcuk University, Turkey, from 2003 to 2007. His research is mainly concerned with renewable and sustainable energy.