Mary I.A. Buttery, Q.C.


 | Vancouver

Mary Buttery (she/her/hers) is a partner in the Restructuring & Insolvency Group at Cassels. Mary has gained national recognition for her involvement in countless significant insolvency files and many prominent litigation matters. Specializing in commercial insolvency and complex, multi-party litigation, she represents financial institutions, debtors and creditors, receivers and trustees in matters related to debt restructuring, corporate reorganizations, loan workouts, fraudulent preference actions, bankruptcy and receiverships. Mary regularly advises clients who are experiencing financial difficulty, or whose customers’ or suppliers’ insolvency affects their business. In addition, Mary is an experienced commercial litigator, with expertise in the enforcement of foreign judgments, class actions, debt enforcement and fraud. She has appeared in all levels of the Ontario and British Columbia courts, the Federal Court, and has been lead counsel in the Supreme Court of Canada. In 2018, Mary was appointed Queen’s Counsel in British Columbia.

Mary has extensive experience in many different sectors, most notably, mining, retail, real estate, forestry and natural resources. She has also served as counsel in class action matters involving automobile wire harnesses and lithium ion battery price fixing.

Mary’s representative work includes having acted for:

  • Walter Canada Energy Holdings, Inc. in its restructuring under the Companies’ Creditors Arrangement Act
  • A major US-based gold mining group in its cross-border insolvency pursuant to Part IV of the Companies’ Creditors Arrangement Act
  • The court-appointed Monitor of Yukon Zinc Corporation and the court-appointed Receiver of Maple Leaf Loading, a multi-jurisdictional trucking company
  • The court-appointed liquidator in world-wide liquidation and asset tracing proceedings with proceedings in Australia, Hong Kong, London and the Cayman Islands
  • Counsel to the Government of the Northwest Territories in relation to the restructuring of North American Tungsten Corporation Ltd., a major tungsten mining operation in the Northwest Territories and Yukon

Mary is recognized by numerous legal directories as a leader in her field and has served as an Adjunct Professor of Law at the University of British Columbia, where she taught insolvency law to upper-year students. She has also authored several articles on varied topics in her area of practice.

  • Appointed Queen’s Counsel
  • Benchmark Canada (Litigation Star: Insolvency)
  • Benchmark Canada (Top 50 Women in Litigation: Canada)
  • Benchmark Canada (Insolvency Litigator of the Year Award: 2021)
  • Best Lawyers in Canada, Lawyer of the Year (Insolvency and Financial Restructuring Law – Vancouver) (2022)
  • Best Lawyers in Canada (Insolvency and Financial Restructuring)
  • Canadian Legal Lexpert Directory (Insolvency & Financial Restructuring – Insolvency Litigation; Insolvency & Financial Restructuring – Financial Restructuring)
  • Chambers Canada (Restructuring/Insolvency)
  • Chambers Global (Restructuring/Insolvency)
  • IFLR1000 (Restructuring & Insolvency)
  • Legal 500 Canada (Restructuring and Insolvency)
  • Lexpert, Rising Star Award
  • Lexpert, Zenith Award
  • Lexpert Special Edition, Litigation
  • Martindale Hubbell, Distinguished™Peer Review Rated
  • Who’s Who Legal: Canada (Restructuring & Insolvency)
  • “Mary is excellent in court, good at getting her point across and advocating for her clients.” – Chambers Canada (Restructuring/Insolvency)
  • “She is client-focused and tenacious.” – Chambers Canada (Restructuring/Insolvency)
  • “Mary’s real strength is her ability in the courtroom.” – Chambers Global (Restructuring/Insolvency)
  • “Mary is fantastic.” – Chambers Canada (Restructuring/Insolvency)
  • “Has a very significant reputation.” – Chambers Global (Restructuring/Insolvency)
  • “‘Extremely well regarded’ and a ‘great advocate for her clients.’” – Chambers Canada (Restructuring/Insolvency)
  • “A fantastic lawyer and a wonderful person.” – Chambers Canada (Restructuring/Insolvency)
  • “A ‘top practitioner’ and a ‘great litigator’” – Chambers Global (Restructuring/Insolvency)
  • BC Cancer Foundation, Board of Directors, Member
  • Collingwood School, Class Parent Volunteer
  • Minerva Foundation for B.C. Women’s Follow A Leader Program (recognized in the Vancouver Sun for her community leadership in association with this role)
  • West Vancouver Field Hockey Association, Assistant Coach
  • Vancouver Aquarium, Board of Governors, Member
  • LL.B., University of Windsor, 1991
  • Ontario, 1993
  • British Columbia, 1997
  • Saskatchewan, 2021
  • American Bankruptcy Institute
  • Annual Review of Insolvency Law, Editorial Board
  • British Columbia Law Society
  • Canadian Association of Insolvency and Restructuring Professionals (CAIRP), Editorial Advisory Board
  • Canadian Bar Association, B.C. Branch, Civil Litigation, Insolvency & Banking Subsections
  • Continuing Legal Education Society of British Columbia, Lecturer
  • Insolvency Institute of Canada (IIC)
  • Law Society of Ontario
  • Turnaround Management Association (TMA)
  • University of British Columbia Law School, Former Adjunct Professor