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Dr. Zahn has a 40-year history of contributions to the Ontario health care sector, both as a practicing physician and in progressive leadership roles at the University Health Network. Prior to this appointment with Ontario Health’s board, she served as Deputy Minister of Health (2021 – 2024) and as President and CEO of the Centre for Addiction and Mental Health (2009 – 2021). 

Throughout her career, Dr. Zahn has worked to promote equitable access to health care for Ontarians, including those with mental illness. She has made numerous contributions through her leadership in hospital integration, technology assessment, chronic disease management, stroke care coordination and health care system integration. 

Dr. Zahn is a Professor in the Faculty of Medicine at the University of Toronto (U of T) and a Fellow of the Royal College of Physicians and Surgeons of Canada. She received her MD (honours) from the Faculty of Medicine at U of T, where she completed her residency training in neurology. She also holds an MSc in health administration from U of T and has completed the Directors Education Program at the Rotman School of Management. Recent honours include membership in the Order of Canada, Doctor of Laws degrees (honoris causa) from Western University and Toronto Metropolitan University, the Bryden Award for Outstanding Achievement (York University) and the Faculty of Medicine Lifetime Achievement Award (U of T). 

Major General (retd) Jean-Robert Bernier served Canada for over 40 years in Princess Patricia’s Canadian Light Infantry, Canadian and US defence intelligence, and the Royal Canadian Medical Service (RCMS). Among other responsibilities, he chaired NATO's Health, Medicine, and Protection research committee, led the military public health agency, and was responsible for health services to military operations, including the Ebola treatment mission to Sierra Leone and the hospital in Kandahar for which Canada received NATO’s highest medical honour. In 2012, he was appointed Canada's 38th Surgeon General, Honorary Physician to Her Majesty the Queen, Head of the RCMS, and Commander of the fully-integrated military health system. In 2015, he was unanimously elected chief medical adviser to the North Atlantic Alliance as chair of the committee of NATO Surgeons General. He has also served on the NATO Science and Technology Board, the Governing Council of the Canadian Institutes of Health Research, the Council of the Royal College of Physicians and Surgeons of Canada, and the board of the University of Ottawa Institute for Mental Health Research. He is also a Franco-Ontarian.