Dr. Mazzulli is the Microbiologist-in-Chief for Sinai Health/University Health Network. He is also the Infectious Diseases Consultant in the Department of Microbiology at Mount Sinai Hospital and University Health Network and the Acting Head, Division of Microbiology, at the University of Toronto.

Tony is certified by the Royal College of Physicians and Surgeons of Canada (RCPSC) in Medical Microbiology and Internal Medicine and holds a certificate of special competence in Infectious Diseases. He is also a consulting Medical Microbiologist at the Public Health Ontario Laboratories.