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Affleck Greene McMurtry LLP | Barristers
Masiel A. Matus

Masiel A. Matus

Masiel A. Matus

Masiel, a Partner of the firm, has a broad commercial litigation practice and represents both national and international clients in a variety of complex business matters. Masiel has expertise in cases involving shareholder disputes, contract disputes, corporate fraud, commercial leasing and real property disputes, breach of trust, professional negligence, D&O claims, and employment matters. Masiel is a tough-minded advocate dedicated to obtaining results for her clients.


  • Represents corporations and shareholders involved in oppression claims as well as directors and officers sued in their personal capacity.
  • Represents owners of commercial real estate in property and leasing disputes as well as environmental contamination claims.
  • Represents investment dealers, financial advisors and other market participants in civil investor loss cases and cryptocurrency related disputes, including regulatory proceedings before the Ontario Securities Commission (OSC) and the Mutual Fund Dealers Association of Canada (MFDA), and defends prosecutions under the Securities Act brought on behalf of the OSC by the Joint Serious Offences Team (JSOT).
  • Represents employers and employees in employment law disputes.
  • While at law school, Masiel was a semi-finalist in the Canadian Client Consultation Competition. Masiel was a Civil Division Leader and caseworker for the University of Ottawa Community Legal Clinic. Masiel was also co-president of the Criminal Law Students Association.
  • Fluent in Spanish.
  • Masiel is a food and wine enthusiast and has achieved the Wine & Spirit Education Trust (WSET) Level 3 Award in Wines with Merit and Distinction.

Practice Areas

  • Corporate and Commercial Litigation
  • Securities Litigation
  • Shareholder & Partnership Disputes
  • Regulatory and Administrative Law

Other Practice Areas

Show More Practice Areas
  • Civil Litigation
  • Contract Disputes
  • Cryptocurrency Disputes
  • Employment Disputes and Wrongful Dismissal
  • Fraud, Misrepresentations, Deceit


  • Partner, Affleck Greene McMurtry LLP, 2021-Present
  • Associate, Affleck Greene McMurtry LLP, 2013-2020
  • Called to the Bar, Ontario, 2013
  • Articling Student, Affleck Greene McMurtry LLP, 2012-2013
  • Civil Division Leader and caseworker, University of Ottawa, Community Legal Clinic, 2011-2012
  • Teaching Assistant, Intensive Alternative Dispute Resolution Program, University of Ottawa, 2010-2011


  • Juris Doctor, University of Ottawa Faculty of Law, 2012
  • Bachelor of Arts with Honours in Criminology, graduated Cum Laude, member of the Dean's Honour Roll, York University, 2009

Memberships & Associations

  • Member of the Law Society of Ontario
  • Member of the Advocates' Society
  • Member of the Canadian Hispanic Bar Association
  • Member of the Women’s White Collar Defense Association
  • Member of the Professional Liability Underwriting Society