O'Sullivan Estate Lawyers LLP

Margaret O'Sullivan

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Practice Areas

Estate planning including multijurisdictional succession issues, powers of attorney/capacity issues, court applications, and trust and estate administration.


Recognized in The Best Lawyers in Canada 2021, Private Client Global Elite 2020, 2021 Canadian Legal Lexpert Directory as a most frequently recommended practitioner in estate planning, and Who's Who Legal: Private Client 2020 as one of the most highly regarded private client lawyers. Ranked Band 1 in Chambers High Net Worth Guide 2020. Recipient of 2014 STEP Founder’s Award for Outstanding Achievement and Ontario Bar Association’s 2013 Award of Excellence in Trusts and Estates Law.

Professional Memberships

Past Deputy Chair, Director, Member of Council and Chair of Professional Standards Committee of Society of Trust and Estate Practitioners (STEP) Worldwide. Past Deputy Chair of STEP (Canada). Member of STEP Cross Border Estates Global Steering Committee. Past Chair, Trusts and Estates Section, Ontario Bar Association (OBA). Academician of The International Academy of Estate and Trust Law. Fellow of American College of Trust and Estate Counsel.


Author, Canada chapter, International Succession Laws, The Private Wealth & Private Client Review, Practical Law Global Private Client Guide and contributor to Lexis Practice Advisor Canada. International Succession Laws, Bloomsbury Professional Publishing, August 2020.