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David Ziegler Toronto Lawyer

David A. Ziegler

Partner Fasken
Recent high-profile cases have highlighted the seriousness with which the courts view the misuse of confidential corporate information by competitors.
Jurisdiction New York, 2011 | Ontario, 2015
Language(s) English
Office(s) Toronto


David Ziegler’s robust civil litigation and arbitration practice encompasses business-critical commercial and financial disputes, class actions, product liability matters, and disputes requiring international arbitration. His vast experience acting for both Canada- and US-based companies is sought after for domestic and cross-border disputes, spanning a broad range of industries including mining, rail, professional services, insurance, banking and finance, accounting, manufacturing, and construction. He is also routinely trusted to advise clients on the enforcement and recognition of foreign judgments in Canada.

A dual-qualified lawyer in New York and Ontario, David leverages experience in securities litigation and general commercial disputes gained while practicing with a leading international law firm in New York, prior to joining Fasken.

Adept in managing large and complex e-Discovery projects, David also advises clients on best practices related to document preservation and collection, the preparation and circulation of litigation holds, and the use of modern data processing tools. He leads an initiative at Fasken to ensure that the Firm maintains and provides a state-of-the-art e-Discovery process for clients.

David maintains an active portfolio of pro bono engagements. He oversees several matters in connection with the TAS-PBO Consumer Protection Initiative – a partnership between The Advocates’ Society (TAS) and Pro Bono Ontario (PBO) – that assists low-income consumers facing the effects of predatory door-to-door sales. David has previously volunteered at the Toronto Small Claims Court in a Duty Counsel capacity, advocating for unrepresented litigants as part of PBO’s Duty Counsel Project.


  • Archibald R. Murray Public Service Award, 2010, 2010
2010 Archibald R. Murray Public Service Award, 2010

Client Work

Date Client

Career & Education


  • JD Fordham Law School
  • BA Wesleyan University

Community involvement

  • Pro Bono Law Ontario Duty Counsel Project

Memberships & Affiliations

  • Member, Law Society of Upper Canada
  • Member, Canadian Bar Association
  • Member, Advocates’ Society
  • Member, Young Canadian Arbitration Practitioners
  • Member, New York State Bar Association
  • Member, International Arbitration brainstorming group, Sedona Conference Working Group 6
  • Member, Canada Advisory Board, International Institute for Conflict Prevention & Resolution
  • Member, International Institute for Conflict Prevention & Resolution Task Force on Remote Video Arbitration Proceedings


Fasken Institute



Speaking Engagements

Misuse of Corporate Confidential Information Fasken Martineau Mini-Symposium location location Toronto


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