I have 35 years of experience in the field of mechanical engineering, with specific knowledge of mechanisms, linkages, dynamics, control, mechatronics and rotating machinery. I have published on such topics as dynamics of machinery, mechanical design, vibrations, robotics and assistive devices, and manufacturing geared drives. I have testified on patent infringement of mechanical devices, control system on a powered wheelchair leading to personal injury, lawn mower accident injury and death due to design defects, and design defect of a textile machine leading to personal injury.