Prof. P.K. Nag, Ph.D., D.Sc., is currently associated with the Ramakrishna Mission Vivekananda University, Belur Math, Kolkata. Prof. Nag is the former Director of the National Institute of Occupational Health (ICMR) Ahmedabad, and Regional Occupational Health Centers (Bangalore and Kolkata). Since his superannuation, he has been re-employed at the School of Environment and Disaster Management, RKMVU. He specializes in the areas of Ergonomics and Human Factors, Environmental Health and Management, Climate Change, Occupational Health and Safety, and has teaching and research experience spanning four decades. He has written several books and reports and published 175 research articles in the journal of repute. Prof. Nag has professional affiliations with numerous national and international agencies in different capacities.