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

Professional Background

Catherine is an Associate 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 regularly appears 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 by Best Lawyers Canada® as “One to Watch”
  • Recipient of the Philip Meyerovitch, Q.C. Prize, awarded for the highest standing in Evidence (Civil)


  • Member, Advocates’ Society
  • Member, Canadian Bar Association
  • Member, Law Society of Ontario
  • Member, Ontario Bar Association