Ahmed Abdelbary is a Chief Engineering and tribology consultant working for the Egyptian Government. He holds a B.Sc. from the Military Technical College MTC in Cairo, and received his MSc and Ph.D. from Alexandria University. He is a full member of the Egyptian Society of Tribology EGTRIB and Egypt Syndicate for Engineers. His research aims to provide a better understanding of the fatigue wear mechanisms in polymers and other materials, and his areas of technical expertise extend to design and manufacture of many mechanical and tribometer systems. He has authored and edited multiple books, chapters, and several research papers with reputable publishers including Elsevier. Li Chang is Senior Lecturer at the School of Aerospace, Mechanical, and Mechatronic Engineering, The University of Sydney, where he teaches courses on the Engineering Materials for Adv Manufacturing, Engineering Tribology, and Design for Advanced Manufacturing. His current research interests include carbon fiber reinforced polymers (their tribology and additive manufacturing), nanomaterials, alloys, and more.