Ravindra Kumar Gautam did his post-graduation in Environmental Science in 2009 from University of Allahabad, India. Thereafter, he worked for one year in National Environmental Engineering Research Institute (NEERI), Council of Scientific & Industrial Research, Nagpur, India. He has published 20 papers including research articles, book chapters, and conference proceedings. He has written a book entitled "Environmental Magnetism: Fundamentals and Applications (ISBN-10: 3659209090 | ISBN-13: 978-3659209093) which was published by Lambert Academic Publishing, Saarbrucken, Germany.M.C. Chattopadhyaya is Professor in Department of Chemistry, University of Allahabad, Allahabad (U.P.) India. He did his Post Graduation in Chemistry from Gorakhpur University with specialization in Inorganic Chemistry in 1967. He was selected for P.G. course in Radiological Physics by Bhabha Atomic Research Centre. He obtained PhD degree from Indian Institute of Technology Bombay, Mumbai.