Peter Vadas MD, PhD

Allergist and Clinical Immunologist

Dr. Vadas has over 10 years of litigation support experience with both plaintiff and defense cases. In his capacity as a medical expert witness in severe and fatal allergic reactions, Dr. Vadas has written opinions and testifed in cases of wrongful deaths or injuries resulting from allergic reactions to hidden and undeclared food allergens, mistaken or delayed diagnoses of drug reactions, and under-recognition and delayed treatment of severe allergic reactions.

As a clinician-teacher and as an expert witness, Dr. Vadas has the credibility, analytical and communications skills and demeanour that make for an effective medical expert witness.

Experienced legal medicine specialist in:

  • initial chart review
  • assisting in the development of litigation strategy
  • thorough research and presentation of balanced review of relevant medical literature
  • preparation of medicolegal opinions


  • Faculty member in teaching hospital of major academic health science centre
  • Senior author of over 100 peer-reviewed publications in high impact journals, including Nature, Journal of the American Medical Association and New England Journal of Medicine
  • National and international leadership positions in Allergy and Clinical Immunology Societies  and related organizations (AAISO, CSACI, OMA, AAAAI, Anaphylaxis Canada)
  • Former examiner in Allergy and Clinical Immunology for the Royal College of Physicians and Surgeons of Canada