Denis P. Dillon headshot
100 Arboretum Drive
Suite 140
Newington, NH 03801
Tel: 603 334 6921

Denis P. Dillon

Director, Trusts & Estates Department

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Denis is a member of the Trusts & Estates Department and practices in the areas of taxation, estate planning, probate law, and elder law, including Medicaid planning. He handles all aspects of federal and state taxation including income taxation, estate and gift taxation. He also advises clients with respect to sophisticated tax, business, succession and estate planning.

Denis began his career in 1992 as a tax attorney with the public accounting firm of Coopers and Lybrand, and prior to joining McLane Middleton he practiced law in Boston, Massachusetts.

Denis received his LL.M. Taxation from Boston University School of Law (1997), J.D. from Western New England College School of Law, cum laude, (1992), M.B.A. from Nichols College (1989) and B.A. from Assumption College (1981).

Areas of Focus

  • Asset Protection and Wealth Preservation
  • Estate Planning and Trust and Estate Administration
  • Taxation



  • New Hampshire
  • Massachusetts
  • Maine
  • New Hampshire Bar Association
  • Massachusetts Bar Association
  • National Academy of Elder Law Attorneys
  • Massachusetts Academy of Elder Law Attorneys
  • New Hampshire Academy of Elder Law Attorneys


  • Best Lawyers in America® 2020 (Trusts & Estates Law)
  • Recipient 2003 Equal Justice Tax Award for pro bono legal service


  • Seacoast Rotary Club, Member
  • New Hampshire Bar Association, Member, Finance Committee
  • Cross Roads House, Board Member
  • 100 Club in Portsmouth, Member
  • Southeastern New Hampshire Land Trust (SLT), past Board Member
  • Leadership Seacoast Class of 2006, Member
  • Wentworth Senior Living, Board of Trustees
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Speaking Engagements

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Practice Areas

The strengths of our practice groups and the industries we serve make McLane Middleton one of the most diverse law firms in New England.

Integrity and trust

At McLane Middleton we establish and maintain long-standing relationships with our clients to help us better achieve their unique goals over time. This approach to building trust requires that our esteemed lawyers and professionals use their broad, in-depth knowledge and work together with integrity to ascertain sound resolutions to legal matters for their clients.

Strength in numbers

McLane Middleton is made up of more than 105 attorneys who represent a broad range of clients throughout the region, delivering customized solutions. As a firm we are recognized as having the highest legal ability rating. The firm is rated Preeminent by Martindale Hubbell and is recognized as one of the nation's leading law firms in Chambers USA. Our attorneys are distinguished leaders in their respective practice areas.

Meet Our People

Commitment and collaboration

McLane Middleton's versatile group of attorneys and paralegals become trusted authorities on each case through collaboration. We work with our clients to learn their individual needs first and foremost and, together, we develop comprehensive solutions to their specific legal matters. This approach helps us exceed our clients' expectations efficiently and effectively, client by client, case by case.

Practice Areas

A history of excellence

McLane Middleton was established in 1919 in New Hampshire, and has five offices across two states. However, deep historical roots don't allow you to become innate. Our firm is organized, technological, and knowledgeable. Our history means we are recognized. But our reputation is built on the highest quality of service and experience in very specific areas of law.

The Firm

Intelligence paired with action

Our team continuously seeks opportunities to enhance their professional development and put key learnings to action. The pursuit of further insight guides us to volunteer service opportunities, speaking engagements, and teaching roles. Our lawyers are sought after thought leaders across their industries, and recipients of leadership awards throughout the region.