K.D. KRORI, PhD (Jadavpur University, Kolkata), is Director, Theoretical Physics Foundation, Guwahati and Member, Physics Academy of the North–East, Guwahati. Having an academic experience of more than 50 years, Dr. Krori has presented/published 150 research papers in many national and international journals. He has been honoured with many awards like Eminent Physicist by Physics Academy (1991). Dr. H.C. Bhuyan Award in Physical Sciences, Assam (1990); and UGC Emeritus Fellowship in Physics (1991–1993). Apart from that, he has also been a member of Editorial Board of Indian Journal of Physics, Kolkata.