Kenneth R. Ratzan, MD is an infectious disease physician and internist located in Miami Beach, specializing in general infectious diseases, including HIV and hepatitis. Dr. Ratzan is also the Chief of Infectious Diseases and Hospital Epidemiologist at Mount Sinai Medical Center and a Professor of Medicine at the Miller School of Medicine at the University of Miami. He joined the University of Miami Department of Medicine in 1972 and Mount Sinai Medical Center in 1975.