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Dr. M. Ramakrishnan is an outstanding Precambrian Geologist who has specialized in the geology of southern India.  He was born at Madurai in 1940.  he did M.Sc from the Presidency College, Chennai and obtained Ph.D. from the Indian Institute of Science, Bangalore.  He retired as Senior Deputy Directory-General of the Geological Survey of India.  He also headed the Centre for the Earth Science Studies, Thiruvananthapuram.  He served as Scientific Board Member of the International Geological Correlation Programme (IGCP) of the UNESCO, Paris, and several committees of the Department of Science and Technology, Government of India.  He was associated with many geoscientific organizations and universities.  He served the Geological Society of India in various capacities including the Editor and Vice President under his mentor Dr. B.P. Radhakrishna.  He was awarded the National Mineral Award and the Mysore Geologists' Gold Medal that was the forrunner of the prestigious Bellur Rama Rao Award of the Geological Society of India.  Field geology was his forte as evidenced from his extensively cited publications on Dharwar and Chhattisgarh geology, Eastern Ghats and Pandyan mobile belts and 'Purana' basins.  M.N. Viswanatha, J. Swami Nath and B. Chadwick were his main field companions.  He has participated in numerous field geological excursions in India and abroad.  He has traveled widely and has worked in the classical high-grade terrain of West Greenland with Prof. B. Chadwick of Exeter University, U.K.  he has collaborated with well-known Precambrian geologists like S. Moorbath, B.F. Windley, A. Kroner, A. Nutman and B.P. Radhakrishna.  He is the compiler of several thematic geological maps and has written and edited valuable books on regional geology.

Prof. R. Vaidyanathan was born in 1931.  He obtained his Master's and Doctoral degrees from the Geology Department, Andhra University, Visakhapatnam and was a faculty member from 1953 and retired as Professor in 1991.  He has his training in Geomorphology and Photo-interpretation in the Geology Department and the Institute of Cartography, Geodesy and Photogrammetry respectively at the Ohio State University, Columbus, Ohio, USA and in Photogeology at the United states Geological Survey, Washington, D.C.  He served as a Professor in Geology at the University of Dar-Es-Salam, Tanzania for two academic years during 1981-83.  He has conducted training programmes in geomorphological mapping for students and professional geologists sponsored by the Department of Science and Technology and the Geological Survey of India respectively.  He has published over 70 papers and supervised 12 students for Ph.D. degree at the Andhra University.  A majority of the papers are in the fields of Quaternary Geology, Geomorphology and Remote Sensing.  He has carried out projects funded by UGC, CSIR, ONGC, DST, ISRO, Ministry of Defence, Planning Commission etc. during 1965-1991.  he was the Editor of the Journal of the Geological Society of India, Bangalore for a term during 1992-1995 and was a Vice President of the Society during 1995-2001.