I have 40 years of experience and specialize in the field of public health (epidemiology) with specific knowledge of foodborne illness, waterborne illness and diarrheal diseases. I have published on such topics as policy issues arising from outbreak investigations and intestinal infectious diseases. I have testified 50 times on topics such as salmonella, E. coli O157:H7, shigella, campylobacter, foodborne illnesses, outbreaks and food safety issues, hazard analysis and critical control point (HACCP), and best business practices.