SANJAY GUPTA, PhD (University of Delhi), is Senior Lecturer in Physics at the School of Sciences, IGNOU, New Delhi. Earlier, he served as Assistant Director (Research) with the Association of Indian Universities, New Delhi, and as Research Associate in the Department of Physics and Astrophysics, University of Delhi. He has also been to the National Open University of Nigeria (NOUN) as Associate Professor at the School of Science and Technology. His research interest is in the area of Neutron Transport. He has published several research papers in national and international journals.