Skip to main content

PLEASE NOTE: For everyone’s safety, Fasken recommends anyone on-site at our Canadian offices be familiar with the COVID-19 recommendations in place which may include one or more of the following: social distancing, hand sanitizing, wearing a mask in common areas and proof of full vaccination. These measures apply to lawyers, staff, clients, service providers and other visitors.

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 has a broad civil litigation and arbitration practice, with a focus on complex commercial and financial disputes, cross-border disputes, product liability, international arbitration, and class actions. David represents clients across a wide range of industries, including mining, rail, professional services, insurance, banking and finance, manufacturing, and construction.

David has extensive experience acting for both Canadian and U.S. companies involved in cross-border disputes resulting in litigation in Canada and regularly advises clients on the enforcement and recognition of foreign judgments in Canada.

David also advises clients on all facets of e-Discovery, including document preservation, the preparation and circulation of litigation holds, document collection, and the use of modern data processing tools.  David is well-versed in managing large and complex e-Discovery projects and is leading an initiative to ensure that Fasken maintains and provides a state of the art e-Discovery process for its clients.

David is actively engaged in pro bono work. He oversees a number of matters in connection with the TAS-PBO Consumer Protection Initiative, a recent initiative launched by The Advocates’ Society and Pro Bono Ontario to help low-income consumers facing the effects of predatory door-to-door sales. He also formerly regularly volunteered as a Duty Counsel at the Toronto Small Claims Court, providing assistance to unrepresented litigants as part of the Pro Bono Law Ontario Duty Counsel Project.

Prior to joining the firm, David practiced in New York as an associate with a leading international law firm. While there, David gained experience in securities litigation and general commercial disputes, as well as in the representation of individuals in NY state and U.S. federal government investigations.


  • 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


    Receive email updates from our team