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Marianne Ignacz

Senior Partner

Marianne Ignacz


T:+1 514.847.4511

Marianne Ignacz’s practice focuses on commercial, corporate and civil litigation, class actions, product liability and professional liability, and more particularly auditors’ liability. She regularly represents clients before all the courts of Quebec and disciplinary bodies. She also assists professionals in providing testimony in investigations undertaken by various regulators or agencies.

Ms. Ignacz has significant experience in successfully handling class action litigation, including securities and shareholders’ claims, pharmaceutical and product liability and civil liability.

She has also been involved in numerous complex international arbitration cases that have proceeded under the AAA (American Arbitration Association) Rules and the ICC (International Chamber of Commerce) Rules of Arbitration and has worked extensively with US and foreign counsel in this regard.

Ms. Ignacz is co-chair of our Canadian class actions team and a member of our Canadian ethics and conflicts of interest committee, our Canadian partnership committee and our global supervisory board. She is former president of the Canadian Bar Association, Quebec Branch, Class Actions Section and a member of the advisory board of the Class Action Defence Quarterly.

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  • Education

    LL.B., Université de Montréal, 1988

  • Representative experience


    Ms. Ignacz has represented or is currently representing:

    • GlaxoSmithKline in a proposed class action in relation to allegations of dependency and withdrawal symptoms arising from the use of the anti-depressant Paxil. The Quebec Superior Court dismissed the motion for authorization in 2009 and the decision was unanimously maintained by the Quebec Court of Appeal in November 2010
    • GlaxoSmithKline in a proposed class action relating to allegations of suicide further to the use of Paxil
    • Sanofi-Aventis Canada and other Sanofi entities in the context of a class action instituted in Quebec further to the recall of Allerject devices used for allergic reactions
    • Deloitte in a class action further to the sale of promissory notes to investors in the alleged Mount Real fraud
    • Deloitte in a class action taken on behalf of investors in a public company
    • Émergis and Telus Health Solutions, in a proposed class action taken on behalf of members of the Association québécoise des pharmaciens propriétaires (Quebec association of pharmacy owners) that raises issues relating to contractual arrangements
    • Hydro-Québec in a proposed class action in Quebec arising from the 1998 ice storm
    • Hydro-Québec in the context of international arbitration further to the 1998 ice storm
    • Johnson and Johnson in a medical device class action involving hip implants
    • Johnson and Johnson in a proposed class action involving the drug Invokana


  • Admissions
    • Quebec 1989
  • Rankings and recognitions
    • Best Lawyers in Canada (13th edition)recognition for her work in Class Action Litigation
    • Acritas StarsTM 2017 and 2018Designated as a “Star” lawyer by a panel of over 4,300 clients
    • Canadian Legal Lexpert Directory, 2014-2017: recommended in Class Actions
    • Canadian Legal Lexpert Directory, 2011, 2012 and 2015: recommended in Professional Liability
    • LMG Life Sciences, 2013-2015: identified as a Life Science Star
    • Expert Guides: Guide to the World's Leading Women in Business Law, 2014: Life Sciences
    • Lawyer Monthly - Women in Law Award 2014: in recognition of her work in the Life Sciences sector
    • International Who’s Who of Life Sciences Lawyers: 2013, 2014
    • Who’s Who Legal, Canada 2014: Life Sciences
    • LMG Life Sciences, 2013: Canadian Product Liability Attorney of the Year
    • Mateesco-Matte Award in Transportation Law
    • Bar of Montreal Award
    • Young Bar Association of Montreal Award
  • Memberships and activities


    • Canadian Bar Association, Quebec Branch
      • Executive Committee, Class Actions Section (2016)
      • Vice President, Class Actions Section (2012-2014)
      • President, Class Actions Section (2014-2016)
      • Liaison Committee with the Superior Court
    • Member of the advisory board of the Class Action Defence Quarterly