About Ronald D. Davis

Ronald D. Davis brings more than four decades of litigation experience to Diamond and Diamond Lawyers, where he serves as Senior Counsel with a focus on class actions. Called to the Ontario Bar in 1984, Ron has spent his career developing creative, strategic approaches to complex disputes, with matters reaching every level of court in Canada, including the Supreme Court of Canada.

Ron's litigation background spans commercial disputes, privacy and data security, real estate litigation, and appellate advocacy, experience that translates directly to the demands of large-scale class proceedings, where strategy, written advocacy, and procedural depth shape outcomes for entire groups of claimants. He is acting in a landmark British Columbia Supreme Court and Court of Appeal constitutional dispute on the application of the province's Personal Information Protection Act to Canada's federal political parties.

Ron has been involved with technology and the law since the 1980s. He cofounded and ran a digital forensics company for several years. He has written and lectured extensively on blockchain technology, and the litigation consequences of cybersecurity and privacy breaches, among the fastest-growing areas of class action law in Canada.

A graduate of the University of Ottawa's Common Law en français program, where he earned his J.D. cum laude, Ron is multilingual and taught at the Law Society of Ontario's Bar Admission Course for a decade. He has edited and written more than 75 articles and books on subjects ranging from legal technology and mortgage litigation to business valuation. He is a member of the Canadian Bar Association, the Ontario Bar Association and the Advocates’ Society. He is a former member of The Sedona Conference Working Group 7 and the Toronto Computer Lawyers' Group.

Beyond the law, Ron holds a Ph.D. in French linguistics from the University of Toronto, where he served as an Assistant Professor, and is an acclaimed jazz pianist and recording artist with 13 albums to date, including a 2020 JUNO Award nomination for Instrumental Album of the Year. He is a past Secretary of The Glenn Gould Foundation and co-produced the annual Jazz for Herbie benefit for Toronto's Hospital for Sick Children for several years. He served on the Board of Directors of Opera 5 and the Avenue Road Music and Performance Academy, and was an Advisory Committee Member of the Jazz Performance and Education Centre.

Representative Cases

• • Rajic v. MacDonald, 2026 ONCA 288
  • Foch v. Sharon Gun Club, 2026 ONCA 218
  • Aylmer Meat Packers Inc. v. Harrison Pensa LLP, 2026 ONCA 156
  • Knisley v. Canada (Attorney General), 2025 ONCA 185
  • Tataryn v. Diamond & Diamond Lawyers LLP, 2025 ONCA 133, leave to appeal to SCC denied, 2025 CanLII 58254 (SCC)
  • Liberal Party of Canada v The Complainants, 2024 BCSC 814
  • Iamgold Corporation v. Treelawn Capital Corp., 2024 ONSC 239 (Div Ct)
  • Capital Sports v. Trinity, 2022 ONSC 6128 (Div Ct)
  • Dunsmuir v. Royal Group, Inc., 2018 ONCA 773
  • Mendoza v. Active Tire & Auto Centre Inc., 2017 ONCA 586, leave to appeal to SCC denied, 2018 CanLII 51172 (SCC)
  • Waterstone Properties Corporation v. Caledon (Town), 2017 ONCA 623
  • Hazelton Lanes Inc. v. 1707590 Ontario Limited, 2014 ONCA 793
  • Marchand v. The Public General Hospital Society of Chatham, 2000 CanLII 16946 (ON CA), leave to appeal to SCC denied, 28379. S.C.C. Bulletin 2001.
  • Gignac v. Neufeld, 1999 CanLII 2182 (ON CA)
  • Stein v. Sandwich West (Township), 1995 CanLII 1239 (ON CA)
  • Datile Financial Corp. v. Royal Trust Corp. of Canada, 1992 CanLII 7661 (ON CA)
  • Chitel v. Rothbart (Ont. C.A.), [1988] O.J. No. 1197, leave to appeal to SCC denied, [1988] S.C.C.A. No. 427.

 

Bar Admission

• Ontario, 1984

Memberships

• Law Society of Upper Canada
• Canadian Bar Association
• Ontario Bar Association
• Advocates' Society