Mary Nan Dupont


Sage Law, LLP
12980 Metcalf Avenue

Suite 500
Overland Park, Kansas 66213

Office (913) 341-7800 

Direct (913) 382-4131

Fax (913) 341-7804


Or use our contact form

Expertise born from experience


  • For over 34 years, Mary Nan Dupont has been practicing law in the area of estate planning and trust and estate administration.

  • After a one-year clerkship with Judge John R. Gibson, a federal court of appeals judge, she began her legal career at Spencer Fane Britt & Browne, achieving partnership status.

  • Mary Nan opened Dupont Law Firm in 2002 and practiced as a sole practitioner for over 12 years.

  • Mary Nan joined the law firm of Sage Law, LLP in 2017.

  • She is licensed in both Kansas and Missouri.

  • She achieved an A-V rating through the national peer-review ranking system with Martindale-Hubbell, which is the highest ranking given to attorneys.


General Information and Civic Involvement

  • Born and raised: Chillicothe, Missouri

  • Married to Michael Thiessen and mother of three children

  • Undergraduate Education:   University of Missouri – Columbia (B.S.B.A. in Finance and Economics 1985) Magna Cum Laude

  • Law degree: University of Missouri – Columbia (J.D. 1988) Cum Laude, Order of the Coif and Law Review

  • Kansas City Symphony League Member - Previous Ball Treasurer, League Treasurer, and Parliamentarian

  • Lyric Opera Circle Member - Previous Ball Treasurer and Parliamentarian

  • Mizzou Letter Winners Board of Directors


Professional Affiliations, Articles and Presentations

  • Missouri Bar Member - Admitted in 1988

  • Kansas Bar Member - Admitted in 1989

  • Children’s Mercy Planned Giving Council Member

  • Author of 2013 Chapter 4 "Drafting a Marital Deduction Will and a Marital Deduction Trust," Missouri Bar Estate Planning Trusts and Estates Series.

  • Presentations for local estate planning organizations, businesses, and non-profits on the following topics:

    • Procedures for Gathering Client Information

    • Charitable Giving Techniques

    • Private Foundations vs. Community Foundation Funds

    • Planning for Disability

    • Choosing a Fiduciary

    • The Use of Disclaimers in the Spousal Situation

    • Joint Trusts - When to Use and When Not to Use

    • What to do When the Client Dies

    • Everybody Needs a Plan: Dispelling the Myths of Estate Planning

    • Business Succession Planning - Survival of the Family Business

    • Generation Skipping Transfer Tax Issues

    • Medicaid, Medicare, and Social Security Planning Issues

    • Handling Unique Assets in Estate Planning

  • Mary Nan taught an Elder Law class at UMKC as an adjunct professor in 2001.


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