Valerie Stiso

Senior Litigation Counsel

4800 – 100 King Street West
Toronto, Ontario, M5X 2A2

Clerk

Bar Admissions

  • Ontario, 2013

Education

  • J.D., Osgoode Hall Law School (2012)
  • B.A. (Hons), University of Toronto (2009)

Professional Accreditations and Affiliations

  • Canadian Bar Association
  • Ontario Bar Association
  • The Advocates’ Society
  • Institute of Corporate Directors

About Lawyer

Valerie Stiso is Senior Litigation Counsel at Aviva Trial Lawyers, where she handles insurance defence and subrogation matters. Prior to joining Aviva, Valerie was a partner in the Municipal Liability and Insurance Litigation group at a leading Canadian business and public law firm. Valerie has cultivated a diverse litigation practice focused on representing Ontario municipalities, insurers, and corporations in a wide range of complex disputes. Her experience includes matters involving personal injury, property damage, building code compliance, occupiers’ liability, product liability, fire and flood claims, and motor vehicle liability, as well as subrogation across these areas. She regularly appears before various levels of court and administrative tribunals in Ontario, including the Superior Court of Justice, Divisional Court, the License Appeal Tribunal and the Health Professions Appeal and Review Board.

 

Known for her practical, client-centered approach, Valerie tailors her litigation strategy to reflect the goals and risk tolerance of her clients, whether that means mounting a vigorous defence or negotiating a favourable settlement. Valerie brings a strong interest in legal operations, professional development, and mentorship to Aviva Trial Lawyers. At her former firm, she served as an articling principal, played an active role in student recruitment, and led training programs focused on both litigation skills and practice management. She has contributed to the design and implementation of professional development programming and has a keen interest in the evolving role of legal technology, including AI tools, as a means of enhancing efficiency and service delivery.

 

Valerie also serves on the Board of Directors of Lawyers Financial, a national not-for-profit organization dedicated to supporting the financial well-being of Canada’s legal community. In this capacity, she helps shape the organization’s strategic direction and ensures sound governance. Her contributions extend through her service on both the Finance Committee and the Audit & Risk Committee.

Personal Interests

Valerie is fluent in French and Italian. Outside of practice, Valerie enjoys spending time with friends and family, traveling, and attending musicals. She is also a lifelong Jeopardy! fan and never misses an opportunity to test her trivia skills.