Dr. P. S. Hemne, Ph.D., was formerly Principal and Head of Postgraduate Department of Physics at Nevjabai Hitkarini College (RTM Nagpur University, Nagpur). He has 40 years of teaching experience and has served as Chairman of Physics, Board of Studies (BOS), Gondwana University, Gadchiroli. C.L. Arora was formerly Principal at D.A.V. Post Graduate College, Jalandhar. Prior to this, he was Principal at D.A.V. College, Amritsar as well as D.A.V. College, Sholapur (Maharashtra). He was selected as Dean of College Development Council in Guru Nanak Dev University, Amritsar