Mary Vidal Hays focuses her practice on estate planning and intellectual property law matters.

In her estate planning practice, Mary represents individuals as well as married and domestic couples. She is highly skilled at administering trusts and estates, preparing estate and gift tax returns, handling estate and gift tax audits, structuring sales to defective grantor trusts, and establishing family limited partnerships.

With respect to her intellectual property law practice, Mary regularly prepares, files and prosecutes trademark applications with the U.S. Patent and Trademark Office and under the Madrid Protocol, one of two treaties comprising the Madrid System for international registration of trademarks.


  • Counseling, drafting and implementing estate plans for a wide variety of clients including young couples, domestic partners and individuals with special needs

  • Establishment and management of family limited partnerships and private foundations for high net worth clients

  • Opening and administration of probate estates, including claims and will contests

  • Creation of special needs trusts for families with members with disabilities

  • Establishment and administration of guardianship estates for minors and adults with disabilities


Mary is a licensed certified public accountant who, prior to joining Aronberg Goldgehn in October 1998, worked as a CPA in the tax department of a large Chicago accounting firm.

In 2018, she was recognized as a Leading Lawyer in the areas of Trust, Will & Estate Planning Law and Copyright & Trademark Law by Illinois Leading Lawyers. In July 2017 she was listed in Crain's Custom Media's inaugural edition of The Most Influential Women Lawyers in Chicago.

Mary frequently presents on a variety of estate planning topics to professional and other groups, and recently authored:


  • Lyons Township High School Boosters Club Board of Directors, Member
  • Lyons Township Community Advisory Council, Member
  • Western Springs Foundation for Education Excellence, Past Board Member and Co-Chair of its 2014 Dinner/Dance

University of Denver Sturm College of Law, J.D., 1995

University of Illinois, Urbana-Champaign, B.S., Accountancy, 1992


  • Illinois
  • U.S. Tax Court


  • Illinois State CPA Society, Member
  • Chicago Estate Planning Council


  • Recognized as an Illinois Leading Lawyer in the Areas of Trust, Will & Estate Planning Law and Copyright & Trademark Law (2018)
  • Included in The Most Influential Women Lawyers in Chicago list published by Crain's (2017)


Outside of the office, Mary enjoys spending time with her family, playing the piano and running, albeit not very far.

What is your favorite thing about working at Aronberg Goldgehn? The people.
What is one item on your bucket list? To go with my favorite people to Machu Picchu.
What is your favorite place in Chicago? A close tie between the Christmas Trees from around the world exhibit at The Museum of Science and Industry, and The Morton Arboretum in Lisle during Autumn when the leaves are changing.
What is the best vacation you’ve ever been on? Every vacation with my family.
What is your favorite restaurant? Le Bouchon
What is something most people don’t know about you? I can’t cook to save my life.