Dr. Harish Kumar is currently Assistant Professor at Department of Mechanical Engineering, National Institute of Technology Delhi. He obtained his B. Tech. (Mechanical & Automation Engineering) and Ph.D. from GGS Indraprastha University, Delhi. His major research interests include mechanical measurement and metrology and composites. He has more than 35 publications to his credit, published in international peer reviewed journals. He has served as Scientist in CSIR-National Physical Laboratory, New Delhi during 2007-2017 and as a guest researcher at National Institute of Standards and Technology, USA in 2016. He has been serving as editor of several peer reviewed journals.   Dr. Prashant K. Jain is currently Associate Professor at Department of Mechanical Engineering, Indian Institute of Information Technology, Design and Manufacturing, Jabalpur. He obtained his B. E. (Mechanical Engineering) from Dr. H. S. Gour University, Sagar, M. E. (Advanced Production Systems) from SATI, Vidisha and Ph. D. from Indian Institute of Technology Delhi, Delhi. He also has served at IIT Delhi as Project Scientist and at Delhi College of Engineering, Delhi (now Delhi Technological University, Delhi) as Lecturer. His major research interests include rapid prototyping / additive manufacturing, geometric modelling, CAD/CAM integration, computational geometry, rapid prototyping and tooling. He has more than 85 publications to his credit, published in international peer reviewed journals, national and international conferences in India and abroad.