Mary Susan Leahy is a Senior Counsel in the Trusts & Estates Department at McLane Middleton, bringing a versatile and deeply experienced approach to estate planning, trust administration, and business succession law. As a Fellow of the American College of Trust and Estate Counsel (ACTEC) and a consistent honoree in Best Lawyers in America since 1997, she stands out for her dual expertise in personal estate matters and complex business transactions.
With a background as a transactional business and real estate attorney, Leahy offers clients integrated counsel on generational planning, including ownership structures for vacation properties and family businesses. She serves as a professional trustee for numerous private trusts and advises charitable foundations and tax-exempt organizations. Her practice is particularly suited to high-net-worth individuals, family-owned businesses, and nonprofit entities seeking sophisticated, tax-efficient strategies for asset preservation and transfer.
Services Offered
- Estate Planning and Trust Administration
- Business Succession Planning
- Tax Planning
- Probate Litigation
- Corporate Business Law
- Generational and Real Estate Planning for Vacation Properties
- Charitable Foundation and Tax-Exempt Organization Counseling
- Professional Trusteeship
Admitted to practice in New Hampshire and Maine state courts, as well as multiple federal courts including the U.S. Supreme Court and U.S. Tax Court, Leahy serves clients throughout New England from the firm’s Portsmouth and Concord offices. She is also recognized for her pro bono contributions and leadership in community organizations such as NH Civics.
