Dr. Arun Kumar, former Propulsion Director at CSIR-National Aerospace Laboratories (NAL), is a distinguished expert in Rotordynamics and advanced propulsion systems. He has served as an adviser to several high-profile committees under DRDO, ADA, and GTRE and continues to mentor esteemed educational institutions across India. With expertise in Rotordynamics, air foil bearings, magnetic bearings and couplings, seals, and journal bearings, Dr. Arun Kumar has demonstrated exceptional proficiency in addressing complex engineering challenges, particularly in the fields of vibrations and rotor systems. His contributions include numerous publications and patents that have advanced the understanding and application of Rotordynamics. Currently serving as the Chief Technical Mentor at DheyaTech, Dr. Arun Kumar leverages his vast experience to guide innovative engineering solutions, fostering excellence in the development of advanced mechanical and propulsion systems.