Catherine has been our trusted point of contact for contractual matters. Her knowledge and experience is incredible. She is very resourceful in terms of case law and impresses with how quickly she picks up on the complexity of cases.

Who’s Who Legal


Catherine Gleason-Mercier is top-ranked by Leading Global Rankings Agencies and Directories.

Professional Background

Catherine is a Partner in the Construction and Infrastructure Practice Group at Singleton Urquhart Reynolds Vogel LLP.  She is a passionate advocate, who focuses on providing business-critical strategic counsel to clients facing complex legal challenges, particularly in complex commercial disputes and construction and infrastructure disputes.  Catherine is dedicated to providing excellent client service, and ensuring the advancement of her clients’ interests with a strategic focus on achieving their overall business objectives.

She has represented a diverse group of clients, including government entities and Crown corporations, owners and general contractors, and multinational public and private corporations. She has represented clients in complex commercial disputes, and has represented clients in the construction and infrastructure industry in a wide variety of disputes involving construction liens and trusts, bond and insurance claims, contract interpretation, delay and extras claims, and professional negligence. Catherine also routinely advises clients on the avoidance and management of risk in the administration of construction contracts.

Catherine has appeared at all levels of court in Ontario and also has extensive experience with mediation and commercial arbitration. She is also a dedicated supporter of Pro Bono Ontario and has regularly appeared as pro bono counsel at the Superior Court of Ontario and the Ontario Court of Appeal.


  • Called to the Ontario Bar, 2013
  • McGill University, Faculty of Law – LL.B and B.C.L. – degree conferred, 2012
  • Clerkship for Credit at Superior Court of Quebec, 2012
  • University of King’s College, BA, First Class Honours in Classics, Dean’s List, 2007

Rankings + Recognitions

  • Recognized as a Leading Lawyer in the  Lexpert® Special Edition on Infrastructure
  • Recognized as a Leading Lawyer in the area of Construction Law in the Canadian Legal Lexpert® Directory.
  • Recognized in Benchmark Canada – The Definitive Guide to Canada’s Leading Litigation Firms & Attorneys as a “Future Litigation Star”
  • Recognized by Best Lawyers Canada®  in the area of Construction Law
  • Recognized by Best Lawyers Canada® as “One to Watch” in the area of Construction Law
  • Recipient of the Philip Meyerovitch, K.C. Prize, awarded for the highest standing in Evidence (Civil)


  • Board of Directors, Associate Partner Program (APP), Ontario General Contractors Association (OGCA)
  • Member, Advocates’ Society
  • Member, Canadian Bar Association
  • Member, Law Society of Ontario
  • Member, Ontario Bar Association