Thomas Slade

Tom wants to ensure you are putting your best foot forward at the appeal stage. From complex legal research to drafting persuasive factums, he helps to elevate appellate advocacy. As a former Editor-in-Chief of the Ottawa Law Review and the founder of Fantasy Courts, Tom provides clients advice that is in tune with the latest developments in the law.

Bar admission.

Ontario, 2011



University of Ottawa, L.L.B., 2010
Carleton University, B.J. (Bachelor of Journalism), 2007


Tel: 613-695-8855
Fax: 613-695-8580

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Thomas Slade is a partner at Supreme Advocacy. His litigation practice is focussed on appeals and leaves to appeal. He has appeared as counsel before the Ontario Court of Appeal and Federal Court of Appeal and as co-counsel at the Supreme Court of Canada. Thomas’ legal research practice includes aboriginal law, constitutional law, religious freedom, professional negligence, and regulatory matters. He has prepared numerous legal opinions, taking complex legal issues and addressing them in a straightforward and practical manner.


Before joining Supreme Advocacy, Thomas articled and returned as an associate at a national law firm where he focused on advocacy and litigation. He also worked as a student-at-law at an access to information and administrative law boutique firm. While at the University of Ottawa, Thomas was the Articles Editor and Editor-in-Chief for the Ottawa Law Review and worked as a research assistant for a prominent technology law professor. Before law school, he received a Bachelor of Journalism from Carleton University.

Recent Non-SCC Work – Appellate & Judicial Review

  • Gateway Bible Baptist Church et al v Manitoba et al, 2023 MBCA 56 – Health law, Charter, religious freedom – Co-counsel for appellants
  • Chippewas of Nawash Unceded First Nation v. Canada (Attorney General), 2022 ONCA 755 – Aboriginal law, title to submerged land or water – Counsel for intervener
  • Canadian Poultry and Egg Processors Council (CPEPC) v. Turkey Farmers of Canada (TFC), Farm Products Council of Canada Complaints Committee, February 2023
  • Curtis v. Medcan Health Management Inc., 2022 ONSC 5176 – Class actions, employment law – Co-counsel for appellant
  • Parker v. Canada (Attorney General), 2022 FC 1244, 2021 FC 496, 2021 FC 447 – Adminstrative law, judicial review, vires challenge to firearms regulations – Co-counsel for applicant
  • Prairies Tubulars (2015) Inc. v. Canada (Border Services Agency), 2022 FCA 92 – Trade law, constitutional law – Co-counsel for appellant
  • Canada v. Jim Shot Both Sides, 2022 FCA 20 – Aboriginal law, breach of treaty, limitation periods – Co-counsel for respondent
  • Restoule v. Canada (Attorney General), 2021 ONCA 779 – Aboriginal law, annuities – Counsel for intervener
  • John Doe v. The Roman Catholic Episcopal Corporation of St. John’s, 2020 NLCA 27 – Tort law, historic sexual abuse claims – Co-counsel for appellants/plaintiffs
  • GCT Canada Limited Partnership v. Vancouver Fraser Port Authority, 2019 FC 1147 – Civil litigation, removal of counsel motion – Co-counsel for respondents
  • Patel v Carson, 2018 SKCA 98 – Administrative law, regulation of professionals – Co-counsel for the appellant
  • Srebrolow Lebowitz Spadafora PC v. PW Lawyers Professional Corporation, 2018 ONCA 64 – Contract law, referral fees – Counsel for the appellant
  • TMS Lighting Ltd. v. KJS Transport Inc., 2017 ONCA 427 – Assessment of damages – Counsel for the appellant

Select Cases as Counsel at SCC

  • Atwater Investment LP v. BMO Life Assurance Company, SCC File No. 39672 – Contract interpretation, insurance – Co-counsel for the applicant
  • Martha Bruno, et al. v. Her Majesty the Queen in the Right of Ontario Represented by the Ministry of Community Safety and Correctional Services, SCC File No. 39441 – Tort law, institutional, sufficiency of reasons – Co-counsel for the applicant
  • R. v. J.A., SCC File No. 39364 – Criminal law, interim release review – Co-counsel for the applicant
  • Hutchingame Growth Capital Corporation v. Independent Electricity System Operator, SCC File No. 3937 – Commercial contracts, interpretation – Co-counsel for the applicant
  • Roman Catholic Episcopal Corporation of St. John’s v. John Doe (G.E.B. #25), et al., SCC File No. 39343 – Tort law, vicarious liability – Co-counsel for the respondents
  • R. v. Kazman, SCC File No. 39077 – Criminal law, delay – Co-counsel for the applicant
  • Basilian Fathers of Toronto v. Roderick MacLeod, SCC File No. 38990 – Tort law, personal injury, historic sexual abuse – Co-counsel for the respondents
  • Satyam Patel v. George Carson (Regina Qu’Appelle Regional Health Authority Senior Medical Officer), et al., SCC File No. 38513 – Judicial review, professional regulation – Co-counsel for the applicant
  • Georgiana Masgras v. St. Mary’s General Hospital, et al., SCC File No. 38109 – Law of professions, client incapacity, duty of lawyer, costs award – Co-counsel for the applicant
  • Chippewas of the Thames First Nation v. Enbridge Pipelines Inc., 2017 SCC 41 and Clyde River (Hamlet) v. Petroleum Geo‑Services Inc., 2017 SCC 40 – Aboriginal law, treaty rights – Co-counsel for an intervener
  • R. v. Barabash, 2015 SCC 29 – Criminal law, private use exception – Co-counsel for the appellant

Select Matters as SCC Agent

  • R. v. Hills, 2023 SCC 2 – Criminal law, sentencing
  • R. v. Haniffa, 2022 SCC 46 – Criminal law, entrapment
  • R. v. Ramelson, 2022 SCC 44 – Criminal law, entrapment
  • Peace River Hydro Partners v. Petrowest Corp., 2022 SCC 41 – Arbitration, bankruptcy
  • R. v. Nahanee, 2022 SCC 37 – Criminal law, sentencing
  • R. v. Brown, 2022 SCC 18 – Criminal law, automatism
  • R. v. Samaniego, 2022 SCC 9 – Criminal law, admissibility of evidence
  • R. v. Ali, 2022 SCC 1 – Criminal law, search and seizure
  • JVD Installations Inc, et al. v. Skookum Creek Power Partnership, et al., SCC File No. 40172 –
  • Fransic Battiston v. Microsoft Canada Inc., SCC File No. 39962 – Contracts, judgments and orders
  • Paul Dass, et al. v. Mark Kay, et al., SCC File No. 39886 – Limitation of actions, summary judgments
  • Tanase v. College of Dental Hygienists of Ontario, SCC File No. 39862 – Professional regulation
  • Canadian Broadcasting Corp. v. Manitoba, 2021 SCC 33 – Publication bans
  • Grant Thornton LLP v. New Brunswick, 2021 SCC 31 – Limitation periods
  • R. v. C.P., 2021 SCC 19 – YCJA, appeals
  • R. v. Ramos, 2021 SCC 15 – Criminal law, credibility of witnesses
  • Peter Nygard v. Attorney General of Canada on behalf of United States of America, SCC File No. 39647 – Extradition
Read more


  • Ontario Bar Association
  • Canadian Bar Association
  • County of Carleton Law Association
  • Supreme Court of Canada Manual: Practice and Advocacy (Thomson Reuters, 2011, loose leaf and updated to 2023) co-author
  • Civil Procedure and Practice in Ontario, Noel Semple (ed.), Canadian Legal Information Institute, 2021 CanLIIDocs 1981, author of chapters 11 & 13
  • OBA, Persuasive Legal Writing, January 25, 2024, presenter on persuasive fact writing (view slides)
  • CBA, Aboriginal Law (North), December 6, 2023, presenter on limitation periods to Indigenous claims (view slides)
  • Runnymede Society, Student Summit, July 23, 2022, presenter on appellate advocacy
  • Law Society of Ontario, The Six-Minute Administrative Lawyer 2018, presenter on administrative law developments at the SCC
  • Resolving Equality Uncertainty: Adverse-effects Claims and Conflicts Between Equality-seeking Claimants, Supreme Court Law Review, 2nd Series, volume 79, 2017, co-author
  • Getting In, Getting Heard, Getting Practical: Intervening in Appellate Courts Across Canada, The Advocates’ Quarterly, volume 46, number 3, January 2017 (Thomson Reuters), co-author
  • Fernandes v. Araujo: Vehicle Ownership, Possession and Vicarious Liability, The Advocates’ Quarterly, volume 45, number 2, March 2016 (Thomson Reuters), co-author
  • Bullen & Leake & Jacob’s Canadian Precedents of Pleadings (Carswell, 2nd ed., 2013) co-author
  • Pro bono lawyer with Refugee Sponsorship Support Program
  • Ottawa Dragon Boat Festival
  • Ottawa Law Review Advisory Board, former member

CCH Canadian Limited Prize, Ottawa Law Review, 2010

Barry C. Scott / CP Railway Scholarship in Business Journalism, Carleton University, 2007