Practice Highlights

David represents accident victims and disabled persons in personal injury, medical malpractice, and disability insurance litigation.

David has appeared on behalf of clients at all levels of court, including the Ontario Court of Appeal, the Federal Court of Appeal and the Supreme Court of Canada where he was successful on behalf of Appellants/Plaintiffs on two different occasions (Sarvanis v. Canada [2002] 1 S.C.R. 921 and Isen v. Simms [2006] 2 S.C.R. 349).

David has lectured at educational programs organized by the Law Society of Upper Canada, the Canadian Institute, the Brain Injury Associations of Niagara, Sault Ste. Marie, Sudbury, Peterborough, Belleville and Ottawa, Mothers Against Drunk Drivers and other medical, rehabilitation and insurance industry groups.

David has the honour of having been selected by his peers for inclusion in The Best Lawyers in Canada® 2017 in the field of personal injury litigation (Copyright 2009 by Woodward/White, Inc., of Aiken, S.C.). David has also had the honour of having been selected by his peers to be published in the Canadian Legal Lexpert® Directory 2016 as a leading practitioner in the field of Personal Injury Litigation. David has also been recognized by the Brain Injury Association of Niagara for his outstanding support for the Association and for those they serve.

Practice Areas:

  • Personal Injury Litigation
  • Disability Insurance Litigation


  • Bachelor of Arts, Trinity College at the University of Toronto (1981)
  • Bachelor of Laws, Osgoode Hall Law School (1986)

Professional Accreditations and Affiliations

  • 2016 Lexpert Ranked Lawyer
  • 2017 Listed in Best Lawyers Canada
  • 2016 Martindale-Hubbell Ranked Lawyer
  • The Advocates’ Society
  • The Ontario Trial Lawyers Association
  • The Metropolitan Toronto Lawyers’ Association
  • The Medico-Legal Society of Toronto
  • Past Director of the Brain Injury Association of Toronto

Additional Information

*David Tenszen Law Professional Corporation

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  • Capes for Kids 2017

    Holland Bloorview Kids Rehabilitaion Hospital's Capes for Kids

    It’s been said that not all heroes wear capes, but in this case, hundreds of heroes will be wearing them. Capes For Kids is an initiative of Holland Bloorview Kids Rehabilitation Hospital to raise funds for the hospital and raise awareness of its programs. From March 6th – 12th, Holland Bloorview is encouraging participants to wear capes … Continued
  • Operation Christmas Child 2016

    Posted December 2, 2016

    During National Collection Week (November 14-20), Thomson, Rogers participated in Operation Christmas Child for the 9th straight year, doing so since 2007. This event gathers gifts and items for children and sends them worldwide to help put smiles on the faces of kids everywhere possible. This year Thomson, Rogers’ staff and lawyers filled 78 boxes full … Continued

    Watch this short biography video and get to know personal injury lawyer David Tenszen, a partner with the Toronto law firm of Thomson Rogers. This is David’s story in his own words. Learn about the person behind the lawyer – why he chose law, what he is passionate about, and why he is the best … Continued
  • Best Lawyers in Canada 2017

    August 10, 2016

    Published annually by Best Lawyers®, The Best Lawyers in Canada is one of the country’s most highly regarded legal directories. Inclusion is based on an exhaustive peer-review survey and a thorough authentication process. We are proud to announce that the following 14 lawyers from Thomson, Rogers were selected for inclusion in 11th Edition of The Best … Continued
  • PIA Law Lawyers Launch Innovative New Personal Injury Module

    December 11, 2015

    Recently, lawyers representing all three of the PIA Law firms worked alongside LexisNexis Canada to help create the Lexis Practice Advisor’s Personal Injury (Ontario) module. The module was designed as a comprehensive guide on how to prepare a personal injury case. Lawyers from across Canada will now have an opportunity to access documents prepared for … Continued
  • Best Lawyers in Canada 2016

    August 24, 2015

    Published annually by Best Lawyers®, The Best Lawyers in Canada is one of the country’s most highly regarded legal directories. Inclusion is based on an exhaustive peer-review survey and a thorough authentication process. We are proud to announce that the following 14 lawyers from Thomson, Rogers were selected for inclusion in the 10th Edition of The … Continued
  • 2015 Canadian Legal Lexpert® Directory Rankings

    We are proud to have 14 of our lawyers selected as leading practitioners in their field.

    Each year Canadian Legal Lexpert® Directory sends out a survey to all lawyers across the country asking who they would recommend as leaders in their respective field. Thomson, Rogers is proud to announce that 14 of our lawyers have been selected as Leading Practitioners for 2015. Congratulations to: Roger T. Beaman – Repeatedly Recommended in Property Development … Continued
  • Snowmobile Accidents and Personal Injury Law

    Toronto Metro - Q&A with David R. Tenszen

    A snowmobile is required to be insured under the same type of insurance policy as a car or truck in Ontario. Therefore, when someone is seriously injured or killed in a snowmobile accident, they and their family can claim no-fault accident benefits from their own snowmobile insurer regardless of who is at fault. . . … Continued
  • April Fools – “Changes to Ontario Auto Insurance Give You More Choice”

    Accident Benefit Reporter | Volume 17, Issue 1 | May 2016

    Just in time for April Fools’ Day, a letter arrived at my home from my automobile insurer.  My insurer was “writing to inform you of upcoming changes to your automobile insurance”.  Enclosed with the letter was an “introduction to these changes, provided by the Financial Services Commission of Ontario.”  The letter advised “your coverages remain … Continued
  • Major Accident Benefits Changes Come into Effect on June 1st, 2016

    Accident Benefits Summary Charts (for accident on or after June 1, 2016)

    To help those in Ontario understand the major automobile insurance changes and the new reduced accident benefits limits, Thomson, Rogers has prepared two useful accident benefits summary charts. The first chart: Statutory Accident Benefits Schedule Summary (for accidents on or after June 1, 2016) highlights the accident benefits available for each of the three categories of … Continued
  • Litigation…And Why You Need A Lawyer

    presented at St. John's Rehab Hospital

  • How You Can Help Your Patients Understand Their Legal Rights

    presented at Lakeridge Health, Whitby Campus

  • Litigating out-of-Ontario accident claims

    The Lawyers Weekly

  • Litigating out-of-province accident

    Advocate Daily

  • How the Treatment, Care and Reports You Provide to Your Patients is Presented and Challenged When the Case Goes to a Trial

    presented at St. John's Rehab Hosptia

  • Impaired Driving Civil Cases

    presented at the 2011 MADD Canada's Victims' Weekend and Candlelight Vigil of Hope & Remembrance

  • Basic Anatomy of Personal Injury Actions

    presented at the Piecing the Puzzle Together: Catastrophic Claims, Tort Claims and the New SABS Conference with Thomson

  • Preparing for and Conducting Effective Examinations for Discovery

    presented at the "New Lawyer Practice Series: Civil Litigation 2011" seminar at the Law Society of Upper Canada

  • Tips on Completing the New Accident Benefit Forms

    presented at the "Back-to-School II with Thomson, Rogers" conference

  • The Rights of a Disabled / Brain Injured Person Returning to Work

    presented at the Provincial Acquired Brain Injury Conference "Harnessing the Power After Brain Injury"

  • The Proposed Accident Benefit Changes

    presented at the Back to School Conference with Thomson, Rogers and the Toronto ABI Network

  • Dealing with Insurers in a Post-DAC World – What the Past 240 Days Have Taught Us

    Brain Injury Association Niagara

  • Catastrophic Impairment Designation: How is this determined, why is this important and how can the ABI team assist in the process?

    presented at Toronto Rehab Institute

  • Coordinating Benefits and the Pursuit of Subrogation Rights: Now you see them; now you don’t – Having your cake and eating it too

    7th Annual Litigation Disability Insurance Claims: Key Updates, Strategic Advice and Practical Techniques to Reduce Legal Risk, presented at The Canadian Institute

  • The Reduction of Total Disability Benefits by the Integration or Offset of Other Disability Benefits (Or….Thanks for your $16.45 Monthly Premium, Now Here is your $9.38 Monthly Benefit)

  • Changes to Auto Insurance-Bill 198

    Ontario Association of Disability Assessors

  • Contending with Appropriate Care Provisions in Individual Disability Insurance Policies

    2nd Annual Litigating Disability Insurance Claims, presented at The Canadian Institute

  • Strategies for Resolving The Claim Before It Becomes a Case