Biography
Keith Grissom focuses his practice on tax and estate planning, closely held business succession planning, and asset protection. He counsels both businesses and individuals on tax matters including addressing income, estate, gift and generation-skipping transfer tax issues related to estate planning and trust administration. Keith frequently works with business owners as well as with multi-generational families on preserving their wealth and the transition of businesses to the next generation. He advises clients on the formation and funding of private foundations and other tax-exempt entities and also provides counsel regarding international planning.
Keith also advises clients on business entity formation, mergers and acquisitions, real estate, and other tax issues, including tax structuring and controversies. He works with businesses on the buy and sell side of transactions to structure deals in the most tax-advantaged manner while preserving deal value.
Keith writes and speaks frequently on tax and estate planning topics, including asset protection planning and business succession planning, and is frequently called upon to analyze and discuss tax legislation and its impact.
Services and Industries
Background
Prior to joining Armstrong Teasdale, Keith was a partner and co-leader of the trusts and estates department at another St. Louis area law firm. Before that, he served as general counsel and project manager for a real estate investment and development company that also functioned as a family office.
Education
- Washington University School of Law (LL.M.)
- Taxation
- Suffolk University Law School (J.D.)
- University of Central Missouri (B.S.)
- Business Administration and Finance
Admissions
Professional Activities
- Attended the American College of Trust Estates Counsel (ACTEC) Heart of America Fellows Institute (2021)
- American Bar Association, Real Property, Trust and Estate and Tax Sections
- Bar Association of Metropolitan St. Louis
- Missouri Bar Estate, Trust & Elder Law Institute, Planning Committee member (2018-2021)
- Missouri Bar Association, Probate & Trust Division
Charitable and Civic Involvement
- Red Cross Planned Giving Council (Co-Chair and Seminar Committee Chair, 2023)
- Washington University Law School Low Income Estate Planning Clinic (2022-2023)
- Volunteer Lawyers and Accountants for the Arts
Accolades
- The Best Lawyers in America®, Trusts and Estates (2022-present)
- Missouri Lawyers Weekly Power List for Tax & Estate Planning Attorneys (2025)









