Lauren Tomasich

Lauren is a partner in the Osler Disputes group and a key contact for the Domestic and International Arbitration Group. Her commercial disputes practice has a particular focus on commercial arbitration, corporate and securities disputes and white-collar defence and enforcement proceedings. Lauren is also a member of the Osler Risk Management and Crisis Response Group, and has acted on teams conducting internal investigations, as well as in managing cross-border regulatory investigations involving parallel class actions.

Lauren has significant experience with domestic and international arbitrations under a variety of procedural rules, including International Chamber of Commerce (ICC), London Court of International Arbitration (LCIA) and multiple ad hoc arbitrations. She has acted on numerous significant and highly confidential arbitrations in the construction, infrastructure, and mining and resource industries.

Lauren has a particular interest in leveraging arbitration procedure to have disputes adjudicated effectively with a view to strategic and business objectives. She designs bespoke dispute resolution provisions in commercial agreements to facilitate effective dispute resolution at the front-end of a deal, and crafts procedural rules in ad hoc arbitrations to deal with unique circumstances. For example, she has acted on matters where she has designed and negotiated unique arbitration procedures, including a highly confidential dispute arising from a private M&A transaction and an emergency arbitration for an online technology learning company. She is also very active in the arbitration community, sitting as the Chair of the Advocates’ Society Arbitration and Mediation practice group, on the board of the ADR Institute of Canada (ADRIC) and is a member of the ICC Canada Arbitration Committee.

Lauren’s corporate and securities disputes practice involves expedited hearings before the Ontario Securities Commission, oppression claims and shareholder disputes. She also works closely with Osler’s Emerging and High Growth Companies group to provide advice to early stage and technology companies, and brings a business-minded view to efficient and effective dispute resolution and risk management at critical stages of companies’ growth.

Lauren has also represented various companies facing class actions in a variety of circumstances, including privacy and data breaches, claims of environmental property damages, securities, product liability and pensions and benefits. She has experience at all stages of a class proceeding, including certification motions, various procedural motions, a large common issues trial and appeal, and costs proceedings.

Lauren has appeared at all levels of court in Ontario, and has spent some time with Osler’s Calgary office, during which time she appeared before the Alberta courts. Lauren was previously seconded to the OSC, during which time she participated in a criminal insider trading trial.

In 2022 Lauren was recognized by Lexpert as one of Canada’s Rising Stars: Canada’s Leading Lawyers Under 40. The Lexpert Rising Stars awards recognize private practice and in-house lawyers who are emerging leaders in the Canadian legal community. Winners are selected by a distinguished advisory board, which considers the contributions that nominees make to their firm, company or department, as well as to the profession and larger community.


Representative Work

  • GitHub Inc.

    GitHub Inc. in its class proceeding concerning an alleged data breach involving the information of credit card applicants

  • Magna International Inc.

    Magna International Inc. in securing court approval of the plan of arrangement for the company’s dual-class share capital reorganization.

  • Carl Icahn

    Carl Icahn in his take-over bid for Lions Gate Entertainment

  • GitHub Inc. in its class proceeding concerning an alleged data breach involving the information of credit card applicants
  • A multinational social media company in a privacy class actions in British Columbia, arising out of interactions with Apple’s operating systems
  • A IT service management company in a privacy class action resulting from a large data breach involving personal information belonging to credit card applicants
  • Vale (Inco) Limited in a class action trial, and the successful appeal of the trial decision (leave to appeal to the Supreme Court of Canada denied). Lauren also acted on various motions before, during and after the common issues trial including a decertification motion, a motion to disqualify one of the plaintiff’s expert witnesses, and a motion to amend the common issues subsequent to the close of trial
  • A large international mining company in an ad hoc arbitration in respect of various claims arising from the construction of a large-scale mineral processing facility
  • A large pharmaceutical company in an investigation by the Autorité des marches financiers with related investigations by US authorities
  • The Canada Mortgage and Housing Corporation in class proceedings dealing with pension surplus and plan amendments, involving complex procedural issues
  • A large North American industrial chemical and services supplier in a confidential, international ad hoc arbitration in respect of a commercial dispute
  • Magna International Inc. in opposing the application before the Ontario Securities Commission, brought by Staff of the OSC and intervening institutional shareholders in opposition to the company’s dual-class share capital reorganization
  • Merrill Lynch Canada in a proposed class action alleging mismanagement of client accounts
  • General Motors of Canada Inc. in class proceedings brought on behalf of a group of former employees in respect of their entitlement to pension benefits following their change of employment
  • A large global manufacturer of water treatment facilities in a complex multi-jurisdictional product liability case involving many parties
  • A CEO of a Canadian energy company in a joint investigation by the US Securities Exchange Commission and the Alberta Securities Commission, and related class proceedings
  • An online educational service provider in a confidential emergency ad hoc arbitration pertaining to a potential business critical service outage
  • An International Client a dispute between joint venture partners under the London Court of International Arbitration (LCIA)

Latest Insights

  • Blog May 8, 2024

    Court confirms difficulty in overturning recognition and enforcement of arbitral award pursuant to UNCITRAL Model Law

    Allegations surrounding arbitrator impartiality and independence are not likely to be entertained by Ontario courts if they have already been...

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    Court confirms difficulty in overturning recognition and enforcement of arbitral award pursuant to UNCITRAL Model Law
  • Webinar Apr 24, 2024

    AccessPrivacy Monthly Call: Data litigation roundtable: key themes and takeaways from recent privacy and data litigation decisions

    In this month’s webinar, Adam Kardash will be joined by Partners from Osler’s specialized privacy and data litigation team to discuss key...

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    AccessPrivacy Monthly Call: Data litigation roundtable: key themes and takeaways from recent privacy and data litigation decisions
  • Report Mar 15, 2024

    Canadian and International Arbitration: A guidebook for effective arbitration

    Overview Arbitration is not simply a private court procedure. It is a way to resolve disputes that allows the ability to choose a decision...

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    Canadian and International Arbitration: A guidebook for effective arbitration
  • Blog Mar 12, 2024

    Just in: IBA updates 2024 Guidelines on Conflicts of Interest in International Arbitration

    The International Bar Association has updated its Guidelines on Conflict of Interest in International Arbitration following broad consultation. Sonia...

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    Just in: IBA updates 2024 Guidelines on Conflicts of Interest in International Arbitration
View all Insights

Awards and Recognition

  • Chambers Canada: Canada’s Leading Lawyers for Business: Recognized in Dispute Resolution: Arbitration
  • Benchmark Litigation Canada: Recognized in Dispute Resolution (40 & Under Hot List; Future Star)
  • The Canadian Legal Lexpert Directory: Recognized in Commercial Arbitration; Litigation – Corporate Commercial; Litigation – Securities
  • Lexpert Rising Stars: Recognized as a Rising Star

Media Mentions

  • Osler News Nov 23, 2023

    23 Osler lawyers recognized in Lexpert Special Edition: Litigation 2023

    23 Osler lawyers featured in the Lexpert Special Edition: Litigation 2023.

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  • Osler News Jun 29, 2023

    29 Osler lawyers recognized in Lexpert Special Edition: Technology and Health 2023

    Congratulations to 29 of our lawyers for their inclusion in the Lexpert Special Edition: Technology and Health 2023.

    Read more
  • Osler News Nov 23, 2022

    Lauren Tomasich and Colena Der named 2022 Lexpert Rising Stars

    Congratulations to Osler partners Lauren Tomasich and Colena Der on being named Lexpert Rising Stars for 2022! The awards recognize emerging leaders...

    Read more
  • Osler News Aug 5, 2022

    Osler lawyers recognized in Benchmark Litigation’s ‘40 & Under List’ 2022

    Osler is proud to congratulate three of our litigators for their recognition in the 2022 edition of Benchmark Litigation’s “40 & Under...

    Read more
View all

Community Involvement

  • Law Help Ontario, Pro Bono Law Ontario, Duty Counsel Volunteer

Speaking and Writing

Speaking Engagements

speaker 24/4/2024
AccessPrivacy Monthly Call: Data litigation roundtable: key themes and takeaways from recent privacy and data litigation decisions
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speaker 25/10/2023
AccessPrivacy Monthly Call: Data litigation roundtable: key takeaways from recent privacy decisions
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speaker 30/11/2022
AccessPrivacy Monthly Call: Data litigation roundtable: litigation risk associated with data breaches and data misuse
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speaker 21/9/2022
Employment and Labour Law Insights: Restrictive covenants; electronic monitoring; vaccination policy case law; Maynard v. Johnson ControlsCanada
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speaker 01/9/2021
AccessPrivacy Monthly Call: Data litigation roundtable: privacy class actions update
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speaker 23/7/2020
Uber Technologies Inc. v. Heller: Implications for Arbitration and Employment Law
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speaker 04/6/2020
The Arbitration Advantage
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speaker 12/12/2019
Year-End Professionalism Series: Random Acts of Professionalism – Trampoline Hall: Legal Edition!
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Published Work

  • Mediation-Arbitration in Canada (L. Tomasich and S. Firestone), LexisNexis Canada Inc., March 2021.
  • Annual Review: Litigation & alternative dispute resolution (interview), Financier Worldwide, November 2018.
  • Ontario overtime class actions: A map for certification? (L. Fric and L. Tomasich), Canadian Employment Law Today, Mar 20, 2015.
  • Re-Arranging the Arrangement Landscape: The Implications of Re Magna International Inc. (C. Lockwood and L. Tomasich), Canadian Bar Review, Vol. 89, No. 3.

Credentials

Education

  • Osgoode Hall Law School, LL.B.
  • University of Calgary, B.A. (with distinction)

Languages

  • English

Professional Affiliations

  • Canadian Bar Association
  • Ontario Bar Association
  • Law Society of Ontario
  • The Advocates’ Society (Arbitration and Mediation Practice Group Chair)
  • ADR Institute of Canada (ADRIC) Board member
  • American Bar Association
  • Young Canadian Arbitration Practitioners (YCAP)
  • Women’s White Collar Defense Association – Toronto Chapter Secretary
  • ROAP Americas, Delos Advanced Oral Advocacy Training Program in International Arbitration (Faculty)