David B. Williams


David Williams is considered one of Ontario's most respected civil litigators, specializing in class action litigation, complex commercial litigation and personal injury at Harrison Pensa. 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. 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. He was also the Managing Partner at Harrison Pensa from 1999 until he stepped down in 2014.

Bachelor of Laws, Western University


  • Recognized by The Best Lawyers in Canada™ for Bet-the-Company Litigation, Corporate and Commercial Litigation, Insurance Law, and Personal Injury Litigation since 2006, Professional Malpractice Law since 2017, and Medical Negligence since 2018
  • Named Best Lawyers “Lawyer of the Year” for the London/Windsor region in the area of Insurance Law and Corporate and Commercial Litigation
  • Lexpert-ranked lawyer recognized in the Canadian Legal Lexpert Directory and the Special Edition of Canada's Leading Litigation Lawyers

Harrison Pensa Lexpert-ranked lawyers for 2022










Law Clerk: Donna Tarr


Complex Commercial Litigation, Medical Malpractice, Personal Injury, Class Actions, Education Law