He has tried over 50 cases and over 12 Daubert hearings. He has been involved in some of the most prominent cases involving hormone therapy, PPA, Rezulin, and other oral anti-diabetic medications, anti-depressants, and silicone gel. Nathan’s expertise involves a heavy emphasis on the scientific and medico-issues that often dominate toxic tort litigation cases. He has challenged a wide variety of expert witnesses, including scientists and physicians, testifying on behalf of the claimants, on immunology, epidemiology, toxicology, polymer and analytical chemistry, rheumatology, neuropsychology, and other areas of clinical medicine.