Atty. David B. "Dave" Williams
Considered by many to be one of Ontario's most respected civil litigators, David Williams practices in the areas of class action litigation, complex commercial litigation and personal injury . Notably, Dave also has a special record of achievement in medical malpractice cases where he has successfully represented plaintiffs.
Profile Summary
About David B. "Dave" Williams at a glance
David B. "Dave" Williams is a personal injury, business, litigation, and insurance attorney based in London, Ontario, practicing at Harrison Pensa LLP. They have 45+ years of legal experience, licensed to practice since 1981. Admitted to practice in Ontario, Law Society of Ontario (1981). Recognitions include Best Lawyers in America — Bet-the-Company Litigation (2026), Best Lawyers in America — Corporate and Commercial Litigation (2026), and Best Lawyers in America — Insurance Law (2026). Serands clients in London, ON and the surrounding metropolitan area.
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About
- Considered by many to be one of Ontario's most respected civil litigators, David Williams practices in the areas of class action litigation, complex commercial litigation and personal injury
- Notably, Dave also has a special record of achievement in medical malpractice cases where he has successfully represented plaintiffs
- He has also been active in representing Ontario lawyers in litigation supported by LawPro — the Ontario lawyer’s professional liability insurance plan
- As a veteran litigator, Dave’s 40-year legal career has brought him before the Trial Division, the Court of Appeal and the Supreme Court of Canada
- He has been involved in many high profile cases including being a member of the plaintiffs’ class action group for the Walkerton contaminated water claim as well as a landmark aboriginal rights dispute
- Recently Dave was co-counsel in a number of significant class action matters which proceeded through lengthy common issue trials and onto appeal
- Dave’s passion for the law is reflected both inside and outside the courts
- Dave served for 10 years on the Law Society of Upper Canada's Civil Litigation Specialty Committee which evaluates applications for specialist certification in civil litigation
- He has taught courses on civil litigation, advocacy and practice for the Bar Admission Course and has also published numerous conference papers in his areas of practice
- Dave is a member of the Canadian Bar Association, Advocates' Society, and the American Association for Justice
- In 2009, Dave was inducted into the American College of Trial Lawyers
- In 2013, he was chosen among Canada’s top lawyers in Corporate and Commercial Litigation, Insurance Law and Personal Injury Litigation
- Moreover, Dave was named "Lawyer of the Year" in London / Windsor by Best Lawyers® between 2011 and 2021 for Corporate and Commercial Litigation, Insurance Law, Personal Injury Litigation, and Personal Injury Malpractice Law
- Only one lawyer in each practice area in each community is honoured as a “Lawyer of the Year.” Dave was also the Managing Partner at Harrison Pensa from 1999 until he stepped down in 2014
Practice Areas Explained
David B. "Dave" Williams's Areas of Practice
Each practice area below reflects the types of cases David B. "Dave" Williams handles, with a brief overview of what that area of law covers.
Personal injury attorneys help accident victims recover compensation for medical bills, lost wages, and pain & suffering. Most work on contingency — no fee unless you win.
David B. "Dave" Williams is one of 264,852 personal injury attorneys indexed nationally. Browse personal injury attorneys in Ontario →
Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.
David B. "Dave" Williams is one of 501,317 business attorneys indexed nationally. Browse business attorneys in Ontario →
Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.
David B. "Dave" Williams is one of 454,532 litigation attorneys indexed nationally. Browse litigation attorneys in Ontario →
Insurance attorneys for coverage disputes, bad faith claims, denied claims, and policy disputes.
David B. "Dave" Williams is one of 121,912 insurance attorneys indexed nationally. Browse insurance attorneys in Ontario →
Jurisdictional Context
Why local counsel matters in Ontario
Practicing law in Ontario. Legal matters in Ontario are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in London are typically filed in the local municipal court or the appropriate Ontario state district court, depending on subject matter and amount in controversy. An attorney licensed in Ontario brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in Ontario courts without local counsel or pro hac vice admission.
Looking for additional Ontario attorneys? Browse all attorneys in London or all attorneys in Ontario.
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