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Catherine Gleason-Mercier

Catherine Gleason-Mercier

Associate, Litigation

Contact Information

tel: 416.862.4247



Bar Admission

Ontario, 2013

  • McGill University, LL.B, B.C.L.
  • University of King’s College, B.A. (First Class Honours)
English, French

Catherine is an associate in the Litigation Group. She maintains a general civil and commercial litigation practice, with experience in complex contractual disputes, construction, procurement and infrastructure litigation, tax and competition litigation, and class actions. Catherine has appeared before the Ontario Superior Court of Justice, the Ontario Divisional Court, and the Ontario Court of Appeal, and has experience in alternative dispute resolution, including mediation and arbitration.

Catherine obtained both her LL.B. and B.C.L. at McGill University. At McGill, Catherine participated in the Laskin Moot and clerked at the Superior Court of Quebec. She received her B.A. (Hons.) in Classics and History at the University of Kings College.  

Catherine joined the firm as a summer student in 2011 and articled at the firm from 2012 to 2013. She returned to the firm as an associate in 2013.

    • A Charitable Corporation in connection with litigation arising from the closure of certain camp properties
    • A Crown Corporation in connection with procurement and insurance disputes
    • An Individual in connection with the appeal of a finding of insider trading
    • A Major Canadian Bank in connection with a tax dispute
    • A Uranium Company in connection with a tax dispute
    • A Renewable Energy Company in connection with arbitrations arising from the construction of various renewable energy projects

  • Recipient of the Philip Meyerovitch, Q.C. Prize awarded for the highest standing in Evidence (Civil) (2012)
  • Member of McGill Laskin Moot Team (2011); winners of Overall Team, Best Factum and Second Pair Overall (Appellants)
  • CCAA Academic All-Canadian; ACAA All Conference “Team A” Varsity Women’s Soccer (2006-2008)

  • Amicus at Ontario Court of Appeal
  • Law Help Ontario, Small Claims Court Duty Counsel Volunteer
  • Co-counsel to coalition of professional women soccer players in challenge of FIFA’s use of turf at Women’s World Cup
  • Give a Night in support of HIV/Aids research co-organizer

  • Ontario Bar Association
  • Canadian Bar Association
  • Law Society of Ontario