Jeng-Nan Lee is Professor of Mechanical Engineering at Cheng Shiu University, Taiwan. He received his Ph.D. in Mechanical Engineering from National Cheng Kung University in 2001, Taiwan. His research interests include the integration of CAD/CAE/CAM, multi-axis machining and toolpath optimization, additive manufacturing (Selected Laser Melting and Directed Energy Deposition), rotary ultrasonic machining (RUM), intelligent manufacturing, and the evaluation of machine tool manufacturing quality. He has conducted many industrial studies on the areas of aerospace industry and biomedical engineering.