Hillary P. Gagnon

Hillary P. Gagnon

Hillary P Gagnon
Phoenix, Arizona

Ms. Gagnon's practice emphasizes estate planning, probate, and probate litigation. Ms. Gagnon assists families and individuals with guardianships, conservatorships and post death administration of trusts and estates. Ms. Gagnon's estate planning work consists of assisting clients develop and prepare a personalized estate plan appropriate for their individual and family needs. An estate plan may include, among other things, a will, revocable living trusts, special needs trust for a disabled child or family member, irrevocable trust, life insurance trust, estate tax planning, durable power of attorney, health care power of attorney, and living will.

Ms. Gagnon's trial and litigation experience includes probate matters, contested estates and trusts, vulnerable adult litigation, contested guardianships and conservators and commercial disputes.

Ms. Gagnon joined Jennings Haug Cunningham in 2000, and became a partner in 2005.

Representative Engagements

  • Represent personal representatives in the post death administration of a family member's estate.
  • Represent trustees in the administration of a Trust.
  • Representation of guardians and conservators of the estates of incapacitated family members, particularly those with long-term care needs.
  • Representation of clients in probate litigation involving contested estates among family members.
  • Advise individuals on developing and revising long-term estate plans and trusts upon entering into a new marriage.
  • Regular representation of couples and individuals in the development or updating of their estate plans and preparation of trusts to protect themselves in the event of their disability and to provide for transfer of their assets at their death.
  • Working with families and individuals in the development and updating of their estate plans to ensure the long-term care of their children with special needs.
  • Court-Appointed Counsel for incapacitated adults in guardianship and conservatorship matters.
  • Assist clients with the formation of limited liability companies and limited liability partnerships.
  • Assist small business clients with succession planning and buy sell agreements.

Areas of Practice

Bar Admissions

  • Arizona
  • U.S. District Court District of Arizona


Suffolk University Law School
J.D., 1997 (With Honors)

Wheaton College
B.S., 1994 (With Honors)

Published Works

  • Long-term Planning for Families with a Special Needs Child, North Central News (Sept. 2012)
  • Importance of a Revocable Living Trust as Part of Your Estate Plan
  • Guardianships and Conservatorships (Fall, 2011)
  • Caring for Aging Parents
  • Changes to Federal Estate & Gift Tax Laws (Jan. 2011)
  • Inexpensive Estate Planning Strategies (June, 2010)
  • Understanding the Revocable Living Trust (May, 2010)
  • 8 Life Stages of Estate Planning by G.M. Filisko quoting Hillary Gagnon
  • Estate Planning and the Special Needs Trust: Protect the Future of Your Special Needs Child (Aug. 2009)

Professional Associations and Memberships

  • State Bar of Arizona, Probate and Trust Section
    • Executive Council
  • Maricopa County Bar Association, Estate Planning, Probate and Trust Section;
    • Estate Planning, Probate and Trust Section Board Member 2011- present
    • Chair, 2013
    • Treasurer, 2016
  • American Bar Association

Pro Bono Activities

  • North Central Pop Warner Football and Cheer Association - Cheer Coordinator and Member of Board of Directors 2015 – present and Cheer Coach 2014 – present
  • Volunteer Attorney for Probate Lawyers Assistance Project

Speaking Engagements

  • Panelist, Women's Financial Forum: Estate Planning for Every Generation hosted by Arizona Bank & Trust (May, 2016)
  • Panelist, Guardians ad litem in Title 14 Proceedings: Manner and Scope of Appointment, presented by State Bar of Arizona (November, 2016)
  • Speaker, Estate Planning - the Fundamentals, sponsored by the Maricopa County Bar Association (January, 2016 and January, 2017)