Deputy Chief Treena MacSween began her policing career in 1998 with Peel Regional Police before joining the Hamilton Police Service in 2001. In 2024, she was appointed Deputy Chief of the London Police Service, bringing more than 28 years of experience in operational, investigative, and administrative leadership.
An accomplished Critical Incident Commander and Public Order Unit Commander, Deputy Chief MacSween has led numerous large-scale operations involving major events and critical incidents. She is deeply committed to building collaborative partnerships that shape effective community safety strategies and is a steadfast advocate
for inclusive workplaces and the wellness of police service members.
for inclusive workplaces and the wellness of police service members.
Recognized as a trailblazer in Canadian policing, her promotion to Deputy Chief marked a historic milestone, making her the highest-ranking Black female police officer in Canada.
In 2025, Deputy Chief MacSween was invested as a Member of the Order of Merit of the Police Forces and also received the King Charles III Diamond Jubilee Medal.
Beyond her operational responsibilities, she serves as Co-Chair of the Canadian Association of Chiefs of Police Equity, Diversity, and Inclusion Committee and is an active member of the Ontario Women in Law Enforcement Advisory Council.
Deputy Chief MacSween is also a proud mother to two daughters, Taylor and Alexis, and shares a strong commitment to public service with her husband, Mike, a firefighter.
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