Dr. M. N. Rao is presently an Emeritus Professor at J N T University, Hyderabad. He obtained Ph D in Environmental Engineering and did Post doctoral work in New Zealand. He taught at IIT Roorkee and NIT Durgapur for 16 years and later moved into Industrial R&D at Bangalore. He then joined Govt. of India and served as Professor and later Director of National Institute for Technical Teachers Training and Research, Chennai for about 10 years. Dr. Rao published 250 Technical papers in National and International Journals, 25 manuals, 5 textbooks and 15 video lessons