- Specialist in Allergy and Clinical Immunology with a practice open to both adults and children
- Associate Professor, Faculty of Medicine, University of Toronto
- Director, Division of Allergy and Clinical Immunology, St. Michael's Hospital
- Director, Regional Anaphylaxis Clinic, University of Toronto
- Former examiner in Allergy and Clinical Immunology, Royal College of Physicians and Surgeons of Canada
- Past chair, Anaphylaxis Committee, American Academy of Allergy, Asthma and Immunology
- Past head, Section of Anaphylaxis, Canadian Society of Allergy and Clinical Immunology
- Founding president, Anaphylaxis Canada
- Author of over 100 publications in peer-reviewed journals and over 20 books and book chapters
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