N.D. Kaushika, formerly professor, Centre for Energy Studies, Indian Institute of Technology Delhi, subsequently director of reputed engineering institutions in Delhi and National Capital Region, is a specialist in renewable energy and environment. He is recipient of S.S. Bhatnagar Research Endowment Award (Hariom Ashram Prerit) for research in Energy Conservation in 1987. Presently consultant at Innovation Centre, Ansal University, Gurgaon. Has earlier been author of two books and has contributed articles in several reputed journals and authored chapters in books by international publishers including Academic Press, USA and Elsevier Science major reference work.K.S. Reddy, Professor of Mechanical Engineering at IIT Madras, Chennai is specialist in solar energy, energy efficiency and environment. Presently, he is also honorary professor at University of Exeter, U.K. and Adjunct Professor, CEERI-CSIR. He has authored more than 150 research papers in reputed international journals and conferences. Dr. Reddy has executed several research projects on solar energy sponsored by various national and international agencies. He is actively involved in development of Concentrating Solar Power technologies in India. He has filed couple of patents on solar CPV and CSP systems. He is associated with several industries on power generation, process heat, energy efficiency & conservation and characterization of engineering materials. He has also organized several national and international workshops on advanced renewable energy technologies at IIT Madras.Kshitij Kaushik, Associate Vice President in Sky Power in Canada is specialized in energy efficiency and solar photovoltaic. He is co-author in one book and has contributed research articles in reputed international journals.