Practice Areas
Estate Litigation
Trust Litigation
Capacity Litigation
Civil Litigation
Professional Liability Litigation
Breach of Trust
Administrative Litigation
Fiduciary Duty Litigation
Will Challenges
Passing of Accounts
Personal Injury Litigation
Medical Malpractice
Commercial Litigation
Judicial Review
Bar Admissions
Ontario
Newfoundland & Labrador
Nova Scotia
British Columbia
Alberta
Lionel is a Partner at Tupman & Bloom LLP. His practice focuses on estate, trust and capacity litigation and civil litigation matters, including professional liability, breach of trust and administrative litigation with a particular focus on matters involving breaches of fiduciary obligations.
Lionel regularly appears before all levels of Courts in Ontario including the Superior Court of Justice, the Divisional Court and the Court of Appeal for Ontario. He is called to the bar in Ontario, Newfoundland and Labrador, Nova Scotia, British Columbia and Alberta. He has appeared as counsel in courts across Canada.
Lionel has experience as counsel in a broad range of litigation matters, including personal injury, medical malpractice, commercial litigation and administrative judicial reviews. Within the estate and trust litigation field, Lionel has argued numerous leading cases related to Will challenges, testamentary and inter vivos undue influence, resulting trusts, and contested passings of accounts.
In his spare time, Lionel was nominated as a candidate for provincial parliament in the Niagara Falls Riding in 2014, and he remains active in politics at the provincial and federal levels.
Lionel is also a former professional bagpiper and saxophonist. He continues to play music for charity events with his nearly all-lawyer blues band, “Oui B Jamon”.
- Passing Accounts Through Time, Estates, Trusts & Pensions Journal, Vo. 44, March 2026 (forthcoming)
- Guest Lecturer, Windsor University Faculty of Law, forthcoming in March 2026
- Essential Evidence for Estate Litigators, Ontario Bar Association, 2025
- Estate Litigation Certificate Program, speaker regarding civil procedure in estate litigation, 2024 and 2025
- Top Cases in Estate Litigation, The Advocates’ Society, 2025
- Top Cases in Estate Litigation, The Advocates’ Society, 2024
- Top Cases in Estate Litigation, The Advocates’ Society, 2023
- Guest Lecturer, Osgoode Hall Law School Estates and Trusts Course, October 2020
- Essential Evidence for Estate Litigators, program co-chair and speaker, July and August, 2020, the Ontario Bar Association
- Proving a Will in Solemn Form, program co-chair, February, 2019, the Ontario Bar Association
- Seguin v Pearson: Due Clarity on Undue Influence, Estates, Trusts and Pensions Journal, Vo. 38, 3, March 2019
- Top Cases in Estate Litigation, speaker, February, 2019, The Advocates’ Society
- Essential Evidence for Estate Litigators, program co-chair, the Ontario Bar Association, April, May and June, 2018,
- Mastering Re-Examination, speaker, the Ontario Bar Association, May, 2018
- Capacity Across Disciplinary Boundaries, Program Chair, the Ontario Bar Association, February, 2018
- Need to Retain Original Wills Emphasized – Commentary in Law Times, November, 2017
- Aboriginal Succession and Inheritance Law, Law Society of Upper Canada Estates and Trusts Summit, October, 2017
- Solicitors’ Negligence in Estate Matters: Bar Association of Prince Edward Island, June, 2017
- Learning to Swim in the Sea of Self-Doubt: Just Magazine, December 16, 2016
- Predatory Marriage – A Primer, Quebec Bar Association, Montreal, March, 2016
- Discrimination by Fiduciary Protection Continuing Federal Paternalism in Aboriginal Succession and Inheritance Law, Advocates Quarterly, Vo. 46, No. 1, September 2016
- The Honour of the Crown and Indian Succession and Inheritance Law in Canada: Fiduciary Production or Creeping Re-Appropriation of Aboriginal Property, The Advocates Quarterly, Vol. 45, No. 2, March 2016
- Competing Doctrines of Undue Influence, Law Society of Upper Canada Estates and Trusts Summit, October, 2015
- American Bar Association: Editor, The Essentials of Merger Review, (textbook) ABA Section of International Law, (Chicago: American Bar Association 2013)
- Co-Author of “Canada” chapter in 2011 ABA Section of International Law Antitrust Year-in-Review publication
- Assistant Editor of 2011 ABA Section of International Law Antitrust Year-in-Review publication in International Comparative Legal Guides
- Co-Author of “Canada” chapter in Cartels & Leniency 2012 publication
- Named a “Lexpert Rising Star: Leading Lawyers Under 40 in Canada,” 2022
- Ranked by Lexpert in Estate and Trust Litigation from 2018 to the present
- Recognized by Lexpert in 2025 as a leading lawyer in estate and trust litigation
- Recognized by Benchmark Litigation from at least 2022 to the present, and in 2026 as a “Litigation Star”
- Recognized by Best Lawyers from 2024 to the present, specifically for trusts and estates and professional malpractice law
- Ontario Bar Association (OBA)
- Chair, Trusts and Estates Executive (after serving 2017–2022)
- Vice Chair, Elder Law Executive (2018)
- Member, Toronto Region Council (two terms)
- Advocates’ Society
- Chair, Estate and Trust Practice Group Executive
- Member, Estate and Trust Practice Group Executiv
- Member, 10+ Standing Committee (appointed 2021)
- Canadian Bar Association (CBA)
- Member-at-Large, Elder Law Executive
- Law Society of Ontario
- Approved Coach, Coach and Advisor Network
- University Club of Toronto
- Past President and Membership Chair
- Ontario Society of Phi Delta Phi Legal Honour Society
- President
