Sanjay Kumar, PhD, is working in the Department of Biotechnology, National Institute of Technology, Andhra Pradesh, India. His research interests include microbial production of biofuels & bio-plastics (PHB), wastewater treatment, bioreactor analysis & design, scale-up of microbial fermentations, and downstream processing of microbial secondary metabolites.Narendra Kumar, PhD, is an associate professor & Head, Department of Biological Sciences and Biotechnology, Institute of Advanced Research, The University for Innovation, Koba Institutional Area, Gandhinagar, Gujarat, India. His research interests include microbial fuel cell, sustainable agriculture, microbial technology & environmental biotechnology. Dr. Kumar has more than 40 publications to his credit, which include research papers, conference papers, book chapters, and edited books.Shahid-ul-Islam, PhD, is a faculty member and researcher in the Department of Chemistry, Islamic University of Science and Technology (IUST), J & K, India. His research is focused on imparting novel functions to polymers using organic chemistry, green technologies, and the valorization of biomass into useful products. He is the author of numerous scientific peer-reviewed journal papers and the editor of many books, several of which are with the Wiley-Scrivener imprint.