Matthew Grupp

Matthew P. Grupp, J.D., LL.M. (in Taxation)




Summary of Practice:

Mr. Matthew Grupp is the managing attorney of The Grupp Law Firm LLC. He helps families of substantial net worth successfully protect and manage their wealth through comprehensive and integrated legal, tax, wealth strategies, and family governance programs. His experience and training allows him to help his clients protect their families by successfully navigating the added complexity wealth introduces into their lives.


Grupp’s practice model encourages a high degree of collaboration with his clients, their family members, and their other trusted legal, tax, and investment advisors to design and administer comprehensive and integrated wealth strategies and family governance programs to preserve, protect, and promote family legacies and to promote charities of his client’s choosing.


The firm’s main office is located in Jackson, Wyoming, with a second office in Post Falls, Idaho.  



Grupp has an experienced background in business, tax, and wealth strategy services. He began his career working in Mergers & Acquisitions and International Tax where he was a Senior Tax Manager in both the Los Angeles and San Francisco offices of Deloitte & Touche, LLP from 1997-2005. During that time, his practice focused on designing and implementing tax strategies for corporate acquisitions, dispositions, spin-offs, joint ventures, financings, reorganizations & restructurings for many leading Fortune 500 companies and private equity firms. Representative clients included Fidelity National Financial, Dole Food, Washington Mutual, Pacificare Health, Texas Pacific Group, the Geneva Companies, and the Yucaipa Companies. 


In 2005, Grupp went into private practice and founded The Grupp Law Firm LLC, with a primary focus on the needs of ultra affluent families and closely held business owners.  To this purpose he engages in income and estate tax planning, asset protection, business exit planning, trust administration and estate settlement, fiduciary representation and services, and the organization and administration of Wyoming Private Family Trust Companies.  


Education and Licensure:

Grupp graduated with his bachelor’s degree in Philosophy and Classical Languages (Greek & Latin) from the University of Montana in 1993. He completed his first year of Law School at The Catholic University of America in 1994 and received his J.D. from the University of Montana School of Law in 1996. He continued on to earn an LL.M. in Taxation from the New York University School of Law in 1997. He is currently licensed to practice Law in Wyoming, Idaho, and New York. 



Grupp is a member of several leading organizations, including:

  • American Bar Association (Tax Section, Real Property, Trust and Estate Section, and Business Law Section)

  • Wealth Counsel (where he has been honored to present at educational events and invited to collaborate on new product offerings)

  • Family Office Exchange

  • Alliance of Merger & Acquisition Advisors (through whom he is a Certified Merger & Acquisition Advisor)

  • Wyoming Business Law Section, Chair (2020-2021)


Practice Areas:

  • Estate Planning

  • Income & Estate Tax Planning

  • Asset Protection Planning

  • Probate & Trust Administration

  • Fiduciary Representation and Services

  • Business Exit Planning


 Other Family Companies:

Grupp has established other family owned companies to offer his clients the full range of business, legal, and strategic planning services they may need. The Grupp Law Firm LLC partners from time-to-time with its sister companies to offer clients a wide range of family and business services. In addition to his work as the Managing member of The Grupp Law Firm LLC, Grupp is the President & CEO of the following companies:

  • Grupp Fiduciary Services LLC

  • Grupp Financial LLC

  • Grupp Digital LLC

  • Grupp Organization LLC


Grupp is committed to making his clients’ visions a reality and is dedicated to promoting their family legacy. He understands and values the importance family has in his clients’ lives from his own personal experience: Matthew is a devoted husband to Carole (his high school sweetheart) and the proud father of their eleven children (7 sons and 4 daughters) and one grandchild. He resides with his family in Star Valley (just south of Jackson Hole, Wyoming).