Atul Kumar Upadhyay is a scholar in the field of environmental science. He completed his PhD in the field of phytoremediation and constructed wetland technology at the CSIR-National Botanical Research Institute, Lucknow, jointly with Kumaun University, Nainital, India. He earned his postgraduation degree from Dr RML Avadh University, Faizabad, India, in the subject of botany. Dr Upadhyay has performed research in the construction and design of wetlands and the plant-based management of water and soil pollution in different states of India, and he has been involved in different activities related to river water rejuvenation, wastewater treatment, wetland design and soil management and pollution control. During his research, Dr Upadhyay has published a number of research papers, articles and chapters in the peer-reviewed journals of national and international repute. He has also published one author book, edited two books from Springer. Currently, Atul Kumar Upadhyay is working as a post-doctoral fellow (UGC-DSKPDF) in the Department of Environmental Science, BBAU (a central university), Lucknow, India, and involved in working on the different aspects of algal-based sustainable phytoremediation, biofuel and bioenergy production. Prof. D. P. Singh, Former Head and Dean of the School for Environmental Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, India, is an eminent scholar in the field of environmental science. He earned his PhD from the Department of Botany, Banaras Hindu University, Varanasi, India. He has worked extensively in the area of wastewater treatment, microbiology, stress physiology, bioremediation and alternative energy options. He has received several honours and awards to his credit, including more than 135 research publications in high impact factor journals of national and international repute. He has supervised more than 24 PhD students and several MSc and MTech students for their research work. He has delivered invited lectures in different seminars and symposia and served as a principal investigator for several governments funded projects. Dr Singh has published five books in the fields of environmental microbiology and biotechnology, stress physiology and sustainable management of soil and water and edited more than ten books with a scientific background with Springer, Elsevier, CRC etc.