I have 34 years of experience, and specialize in the field of fiber science and cosmetic chemistry with specific knowledge in the areas of treatment of fibers with various products and hair and cosmetic interaction, product efficacy evaluation and hair damage caused by grooming methods and products. I have published on such topics as diffusion of dues and colors in fibers and hair, developing methods of testing product efficacy on fiber assemblies and effect of shampoos and conditioners. I have testified on hair relaxer damage (deposition), hair loss (affidavit) and hair flammability (affidavit).