Prof. P.K. Nag, Ph.D., D.Sc., is currently associated with the Ramakrishna Mission Vivekananda Educational and Research Institute (Deemed University), Belur Math, Kolkata. Prof. Nag is the former Director of the National Institute of Occupational Health (Indian Council of Medical Research) Ahmedabad, and Regional Occupational Health Centers (Bangalore and Kolkata). 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 reputed journals. Prof. Nag has professional affiliations with numerous national and international agencies in different capacities.   Dr L.P. Gite, PhD, superannuated from the Central Institute of Agricultural Engineering (Indian Council of Agricultural Research), Bhopal, India as a Project Coordinator and Emeritus Scientist. He has been profoundly involved to promote about ergonomics principles in the design and application of agricultural tools and equipment, and strengthen such research in agricultural engineering, and allied institutes, and Standards bodies. He has authored multiple books and about 55 research papers which were published in reputed national and international journals.