Atty. Donald O. Hackmann

Atty. Donald O. Hackmann

Donald O. Hackmann is a lawyer practicing business, estate planning, contracts & agreements and 1 other area of law.

Brentwood Brentwood 47 Years Experience 47 year
Call (314) 530-3951

Profile Summary

About Donald O. Hackmann at a glance

Donald O. Hackmann is a Member based in Brentwood, Missouri, practicing at Donald O. Hackmann. They have 47+ years of legal experience, licensed to practice since 1979. Their practice focuses on contracts, estate planning, business, and tax. Admitted to practice in Missouri (1979). Educated at St. Louis University (J.D., 1979) and University of Missouri B.S. (—). Serves clients in Brentwood, MO and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Donald O. Hackmann is a lawyer practicing business, estate planning, contracts & agreements and 1 other area of law
  • Donald received a B.S. degree from University of Missouri, and has been licensed for 47 years
  • Donald practices at Donald O. Hackmann in Brentwood, MO

Practice Areas Explained

Donald O. Hackmann's Areas of Practice

Each practice area below reflects the types of cases Donald O. Hackmann handles, with a brief overview of what that area of law covers.

Contracts

Donald O. Hackmann is one of 67,443 contracts attorneys indexed nationally. Browse contracts attorneys in Missouri →

Estate Planning & Probate

An estate planning attorney prepares wills, trusts, powers of attorney, and healthcare directives to protect your family and pass on your assets.

Donald O. Hackmann is one of 203,974 estate planning attorneys indexed nationally. Browse estate planning attorneys in Missouri →

Business & Corporate Law

Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.

Donald O. Hackmann is one of 452,854 business attorneys indexed nationally. Browse business attorneys in Missouri →

Tax Law

Tax attorneys handle IRS audits, tax debt, international tax, estate planning, and tax court litigation.

Donald O. Hackmann is one of 77,130 tax attorneys indexed nationally. Browse tax attorneys in Missouri →

Jurisdictional Context

Why local counsel matters in Missouri

Practicing law in Missouri. Legal matters in Missouri are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Brentwood are typically filed in the local municipal court or the appropriate Missouri state district court, depending on subject matter and amount in controversy. An attorney licensed in Missouri brings working knowledge of local procedural deadlines, judicial practices in this venue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in Missouri courts without local counsel or pro hac vice admission.

Looking for additional Missouri attorneys? Browse all attorneys in Brentwood or all attorneys in Missouri.

Frequently Asked

Common questions about Donald O. Hackmann

Where is Donald O. Hackmann's law office located?
Donald O. Hackmann's law practice is located in Brentwood, Missouri. The firm is Donald O. Hackmann. You can contact the office directly through this profile page.
What practice areas does Donald O. Hackmann handle?
Donald O. Hackmann focuses on contracts, estate planning, business, tax. Each practice area listed reflects experience handling cases of that type in Missouri.
How long has Donald O. Hackmann practiced law?
Donald O. Hackmann has 47+ years of legal experience and has been licensed since 1979.
Where did Donald O. Hackmann go to law school?
Donald O. Hackmann earned their education at (J.D., 1979); (—).
How can I contact Donald O. Hackmann for a consultation?
You can contact Donald O. Hackmann directly through this profile page. Click "Ask the Attorney" to submit a question, or "Schedule a Consultation" to book a meeting. Most claimed-profile attorneys respond within one business day.

Education

J.D.
St. Louis University
- 1979
University of Missouri B.S.
- In Progress

Bar Admissions

Missouri
Admitted: 1979

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