Roger Lewis is a Professor of Mechanical Engineering at the University of Sheffield, United Kingdom. He holds an MEng in Mechanical Engineering and a Ph.D. from the University of Sheffield. His research focuses on tribology, friction, wear, rolling contact fatigue, and wheel–rail contact mechanics. He has extensive experience in railway engineering, friction management, surface engineering, and the development of tribological solutions for industrial applications. He is a Chartered Engineer and a Fellow of the Institution of Mechanical Engineers. His distinctions include the Tribology Trust Bronze Medal, the Institute of Physics Innovation in Tribology Prize, and the Donald Julius Groen Prize in Tribology.