Sean A. Hagan

Top rated Estate Planning & Probate attorney in Boston, Massachusetts

Long Hagan Huff Harris
Sean A. Hagan
Long Hagan Huff Harris

Practice areas: Estate Planning & Probate, Business & Corporate, Estate & Trust Litigation; view more

Licensed in Massachusetts since: 2014

Education: Suffolk University Law School

Selected to Super Lawyers: 2025 Selected to Rising Stars: 2018 - 2024
Virtual Appointments Free Consultation

Long Hagan Huff Harris

4238 Washington Street
Unit B
Boston, MA 02131 Visit website
Details

Sean A. Hagan, a partner at Long Hagan Huff-Harris in Boston, Massachusetts, is known for his skill in guiding clients through the intricacies of estate and tax planning, trust and estate administration, and business law. With a remarkable ability to simplify the complex, he helps clients navigate important decisions regarding their family's financial well-being. His blend of technical precision and heartfelt understanding has earned him the trust of countless families and business owners across Massachusetts.

Mr. Hagan actively safeguards assets through comprehensive estate and tax strategies, including wills, trusts and estate management. He combines analytical rigor with genuine compassion, offering clients clear explanations and tailored solutions for their most pressing concerns. He excels at connecting with people, ensuring they fully grasp their options at every stage. His dedication to client service is matched by his commitment to community, as he blends professional excellence with a sincere desire to help families secure their futures and confidently embrace life's transitions.

Mr. Hagan's academic journey began with a B.A. in anthropology from the University of Vermont, followed by a J.D. from Suffolk University Law School and an LL.M. in taxation from Boston University School of Law's graduate tax program. While at law school, he contributed to the Suffolk Transnational Law Review and gained valuable experience as a law clerk at estate planning and elder law firms. Before joining Long Hagan Huff-Harris, he served as a senior editor at a prominent federal research firm for tax professionals.

A respected figure in the legal sphere, Mr. Hagan is actively involved with the Boston Bar Association, the Plymouth County Bar Association, the Massachusetts Bar Association, and the American Bar Association. For several years, he taught legal research and writing to paralegal students at Bunker Hill Community College. He also contributes as a board member for the In Control Family Foundation, a nonprofit focused on reducing injuries and fatalities among Massachusetts families. His community involvement extends to the Plymouth Chamber of Commerce, The Duxbury Chamber of Commerce and the Kingston Public Library Foundation. 

Practice areas

Estate Planning & Probate, Business/Corporate, Estate & Trust Litigation, Family Law, Tax: Consumer

Focus areas

Adoption, Alimony & Spousal Support, Business Formation and Planning, Business Organizations, Child Support, Contracts, Custody & Visitation, Dissolution, Divorce, Domestic Violence, Estate Planning, Father's Rights, Juvenile Law, Limited Liability Companies, Living Wills, Marital Property, Mediation & Collaborative Law, Name Change, Partnership, Paternity, Power of Attorney, Prenuptial Agreements, Probate & Estate Administration, Same Sex Family Law, Sub-chapter S Corporations, Tax Law, Trusts, Will Contests, Wills

  • 50% Estate Planning & Probate
  • 20% Business/Corporate
  • 10% Estate & Trust Litigation
  • 10% Family Law
  • 10% Tax: Consumer

First Admitted: 2014, Massachusetts

Professional Webpage: https://lhhlegal.com/attorney-boston-massachusetts/estate-pl...

Bar / Professional Activity

  • Commonwealth of Massachusetts
  • American Bar Association, Member
  • Massachusetts Bar Association, Member
  • Boston Bar Association, Member, 2014-Present
  • Plymouth County Bar Association
  • South Shore Professional Networking Group
  • N2BP Networking Group (Part of Charles River Regional Chamber)

Pro bono / Community Service

  • Plymouth Chamber of Commerce
  • Duxbury Chamber of Commerce, Board Member, 2023-Present
  • Kingston Public Library Foundation
  • In Control Family Foundation. A 501(c)(3) tax-exempt non-profit organization, dedicated to drastically reducing automobile crashes through hands on instruction and community engagement, Member, 2016-Present
  • Waterfront Committee of Kingston, MA

Honors

  • Rising Star 2018-2024, Super Lawyers
  • Super Lawyer, Super Lawyers, 2025

Educational Background

  • University of Vermont, B.A. in Anthropology
  • Boston University School of Law, LL.M., Taxation, Graduate Tax Program

Scholarly Lectures / Writings

  • Law Review Note Covering IUU Pirate Fishing, Too Big to Tackle? The Persistent Problem of Pirate Fishing and the New Focus on Port State Measures, Suffolk University Law School - Transnational Law Review, 2014
  • Lecturer, Bunker Hill Community College

Other Outstanding Achievements

  • Best of South Shore (Massachusetts) - Estate Planning - 2023, 2024, & 2025  The Best of the South Shore Awards is a community-driven contest hosted annually on the South Shore Home, Life & Style website, 2025
Industry Groups:
  • And Family Law
  • Business Law
  • Estate And Trust Administration
  • Estate Planning

Office location for Sean A. Hagan

4238 Washington Street
Unit B
Boston, MA 02131

Phone: 617-362-9482

Selections

1 Year Super Lawyers
7 Years Rising Stars
  • Super Lawyers: 2025
  • Rising Stars: 2018 - 2024

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