The late Dr. Charles O. Thoen, international Tuberculosis expert, spoke preciently about … Tuberculosis in Animals and Humans: A One Health Approach :: Click here to see the 24 minute audio/video film :: - (2016) Charles O. Thoen, DVM, PhD Past President, American Veterinary Epidemiology Society Professor, Department of Veterinary Microbiology and Preventive Medicine College of Veterinary Medicine Iowa State University Ames, IA 50011