I have 40 years of experience, and specialize in the field of chemistry and biology of drug design and action with specific knowledge in the areas of anticancer and antiviral drugs, enzyme inhibitors and prodrugs. I have published on such topics as design, synthesis and study of selective enzyme inhibitors, cellular pharmacology of cytotoxic drugs and biochemical mechanisms of folic acid coenzymes and antagonists. I have testified on structural similarities and differences of drugs, validity of patent claims related to structure and pharmacological activity and obviousness.