Essentials of Ecology and Environmental Science About the Author S. V. S. Rana, Ph.D., is a former Vice Chancellor of Bundelkhand University, Jhansi. He has served Chaudhary Charan Singh University, Meerut as Professor and Head, Department of Zoology; Coordinator, Department of Environmental Science; and Coordinator, UGC Innovative Assistance Program in Toxicology. He has more than forty years of teaching and research experience.Professor Rana has authored/edited a number of books on ecology and environmental science, and has contributed numerous research papers in national and international journals. He is associated with a number of national and international scientific societies in the field of environment and toxicology in various capacities. He has received a large number of awards and fellowships for his contribution to this field.