Thomas Isaac

Partner | 
Vancouver

Thomas Isaac is a partner in the Business Law Group at Cassels and serves as Chair of the firm’s Aboriginal Law Group. A nationally recognized authority in Aboriginal law, Tom advises business and government clients across Canada on Aboriginal legal matters and related environmental assessments, negotiations, and regulatory and constitutional issues. Tom has extensive national experience advising energy, oil, gas, pipeline, mining and forestry companies, lenders and investors, and federal, provincial, territorial and municipal governments and agencies on Aboriginal and project-related regulatory and environmental matters. He regularly negotiates on behalf of industry and governments concerning impact, benefit, economic development, replacement tenures, and access agreements with Aboriginal groups, and advises on Aboriginal consultation and accommodation processes and agreements. In recognition of his important and significant work in this area, Tom was honoured as one of Canada’s “Top 25 Most Influential” lawyers by Canadian Lawyer magazine in 2018.

Tom’s litigation practice is national in scope and focuses on representing clients in Aboriginal-related matters before courts and tribunals across Canada, including: Supreme Court of Canada, Federal Court of Canada, Ontario, British Columbia and Pei Courts of Appeal and lower courts, Manitoba Court of Queen’s Bench, Northwest Territories, and Yukon Supreme Courts; and the National Energy Board, Ontario Energy Board, and British Columbia Environmental Appeal Board. His published works on Aboriginal law have been cited with approval by Canadian courts, including the Supreme Court of Canada and the Federal Court of Appeal. Tom has also served as a mediator involving complex, multi-jurisdictional Aboriginal-related disputes.

Tom is a former Chief Treaty Negotiator for the Government of British Columbia and former Assistant Deputy Minister responsible for establishing Nunavut for the Government of the Northwest Territories. He also served in a senior capacity with the Government of Saskatchewan dealing with Aboriginal issues. Tom has published extensively in Aboriginal law, including 15 books, most notable Aboriginal Law, 5th Ed.

Tom was the Minister’s Special Representative to the Minister of Indigenous and Northern Affairs regarding a Section 35 Métis Rights and Reconciliation Framework and a reconciliation approach for the Supreme Court of Canada’s decision in March 2013 in Manitoba Métis Federation v. Canada. His Report – A Matter of National and Constitutional Import: Métis Section 35 Rights and the Manitoba Metis Federation Decision – was released by Canada in July 2016. Tom also served as the Minister’s Special Representative to the Minister of Indigenous and Northern Affairs and the Premier of the Northwest Territories regarding the Akaitcho Dene and NWT Métis Nation negotiations in the Northwest Territories. His Report – A Path to Reconciliation – was released by both governments in March 2017.

Tom is presently serving as the Minister’s Special Representative for the Minister of Indigenous and Northern Affairs to conduct exploratory discussions on the Gottfriedson class action lawsuit against the Government of Canada relating to residential school day students.

  • Benchmark Canada (Aboriginal Law, Energy & Natural Resources, Environmental)
  • Best Lawyers in Canada (Aboriginal)
  • Best Lawyers in Canada, Lawyer of the Year (Aboriginal, Calgary) (2015 & 2017)
  • Canadian Lawyer, Top 25 Most Influential Lawyers (2018)
  • Canadian Legal Lexpert Directory (Aboriginal Law)
  • Chambers Global (Aboriginal Law, Band 1)
  • Chambers Canada (Aboriginal Law, Band 1)
  • Lexpert Guide to US/Canada Cross-Border Lawyers in Canada
  • Lexpert Special Edition, Global Leaders in Mining
  • Lexpert Special Edition, Leading Lawyers in Infrastructure
  • “A formidable reputation.” – Chambers Global (Aboriginal)
  • “One of the country’s leading lawyers in the field of Aboriginal law.” – Chambers Canada (Aboriginal)
  • “The well respected Thomas Isaac is unequivocally deemed as a ‘leader on this front’.” – Chambers Canada (Aboriginal)
  • “He is very personable, easy to approach and he listens well – he is very responsive to what your needs and concerns are.” – Chambers Canada (Aboriginal)
  • “A giant in the Aboriginal field.” – Chambers (Aboriginal)
  • “A very passionate, energetic and knowledgeable lawyer.” – Chambers (Aboriginal)
  • “His reputation speaks for itself.” – Chambers Global (Aboriginal)
  • LL.M., University of Saskatchewan, 1993
  • LL.B., University of New Brunswick, 1990
  • M.A., Dalhousie University, 1989
  • B.A., St. Thomas University, 1987
  • British Columbia, 2001
  • Northwest Territories, 2003
  • Nunavut, 2003
  • Alberta, 2006
  • Yukon, 2010
  • Ontario, 2019
  • Law Society of Alberta
  • Law Society of British Columbia
  • Law Society of Northwest Territories
  • Law Society of Nunavut
  • Law Society of Ontario
  • Law Society of Saskatchewan
  • Law Society of Yukon