I have 35 years of experience, and specialize in the field of mechanical engineering with specific knowledge in the areas of machine design and safety, product liability, bicycle design and safety, and biomechanics of knee injuries. I have published on such topics as bicycle design and safety, biomechanics of knee injuries and surgical procedures to repair knee injury. I have testified 50 times on topics such as machine design and safety, product liability, bicycle design and safety, and biomechanics of knee injury.