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Maria Tassou

Senior Counsel
Maria Tassou


LL.B., Osgoode Hall Law School (1996)
Specialist of Management Program, University of Toronto (1990-1993)

Called to the Ontario Bar, 1998

Other Languages



Maria Tassou is a member of both the Commercial Litigation and Employment & Labour Practice Groups.

Her practice focuses on Administrative Law, Workplace Investigations, Management Training and Privacy Law. Maria serves as Privacy Officer for the firm.

Maria is a certified workplace investigator. She can be retained as an impartial, third-party investigator to conduct efficient, sensitive, and objective investigations into workplace misconduct, such as breaches of workplace policy, and allegations of bullying, harassment, sexual harassment, or discrimination. She is also available to provide legal advice and guidance to employers and human resources professionals conducting their own internal investigations.

Maria has extensive experience as a civil litigator and is a seasoned adjudicator, presiding over hearings involving a broad range of matters, in both the private and public sector.

Maria was the Chair and lead adjudicator of the Criminal Injuries Compensation Board, an adjudicative tribunal, for five years. She was also a Vice-Chair of several other tribunals in Ontario including the Human Rights Tribunal of Ontario, Landlord Tenant Board, Social Benefits Tribunal and Licence Appeal Tribunal.

As a seasoned adjudicator, Maria has extensive experience eliciting evidence, questioning parties, maintaining confidentiality, and protecting the privacy interests of all parties. She has adjudicated a multitude of claims involving criminal harassment, sexual assault, physical violence, threats, internet crimes, and human trafficking in a fair and impartial manner.

Maria understands the importance of procedural fairness and natural justice. She is respectful of social and cultural differences and acts in a manner that promotes an appreciation for diversity. She has engaged in meaningful outreach and public consultations strengthening stakeholder relations among government agencies, police services, advocacy organizations and the Ombudsman’s office.

She also has experience protecting personal and sensitive information and dealing with third party requests for information as the designated head of an institution pursuant to the Freedom of Information and Protection of Privacy Act.


  • Member, Law Society of Ontario
  • Member, Canadian Bar Association
  • Member, Ontario Bar Association
  • Member, Institute of Public Administration of Canada
  • Member, Society of Ontario Adjudicators and Regulators
  • Member, Association of Workplace Investigators
  • Member, Canadian Italian Advocates Organization
  • Professional Member, International Association of Privacy Professionals (IAPP)
  • Member, Human Resources Professionals Association​ (HRPA)
  • Volunteer Committee Member, Community Foundation of Mississauga
  • Past Member, National Joint Committee of Senior Criminal Justice Officials
  • Past Member, SOAR Education Committee for Adjudicators
  • Past Member, Toronto Police Service Victim Witness Support Advisory Committee
  • Past Member, Ontario Association of Chiefs of Police Victim Subcommittee
  • Past Member, HALC Trans Legal Needs Committee


  • Panelist, Advice for Appearing before Tribunals, Ontario Bar Association
  • Panelist, Fairness, Mental Health and Administrative Process, Osgoode Symposium
  • Speaker, Effective Time Management Strategies for Adjudicators
  • Speaker, Electronic Hearing Briefs, Going Paperless
  • Panelist, Compassion Fatigue, SOAR’s 29th Annual Conference for Adjudicators
  • Speaker, Presentation to Sexual Violence Advisory Group of Crown Attorneys
  • Panelist, Administrative Law Practice Basics, Law Society of Upper Canada
  • Panelist, The View from the Chair, Association of Law Officers of the Crown
  • Speaker, Ontario Association of Chiefs of Police, Accessing Police Records
  • Speaker, Office of the Public Guardian and Trustee, Education re Tribunal Hearings
  • Speaker, Lean on Me, Supporting Families of Homicide
  • Speaker, Association of Traumatic Stress Specialists Conference
  • Speaker, Ombudsman’s Office
  • Speaker, Operational Change Management Conference
  • Speaker, York Region Children’s Aid Society
  • Speaker, Victim/Witness Assistance Programs
  • Speaker, Parkdale Community Legal Services – Intensive Program in Poverty Law


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