Atty. Mark S. Deiermann

Atty. Mark S. Deiermann

Mark S. Deiermann is a lawyer practicing lawsuits / disputes, commercial, commercial litigation.

St. Louis St. Louis 45 yrs experience 45 year
Call (314) 408-3130 Book Appointment

Profile Summary

About Mark S. Deiermann at a glance

Mark S. Deiermann is a Partner based in St. Louis, Missouri, practicing at Bryan Cave Leighton Paisner LLP. They have 45+ years of legal experience, licensed to practice since 1981. Their practice focuses on business and litigation. Admitted to practice in Missouri U.S. Court of Appeals, Eighth Circuit U.S. District Court, Eastern District of Missouri (1981). Educated at University of Utah (J.D., 1981) and University of Missouri - Columbia (B.A., 1978). Recognitions include AV Preeminent. Serands clients in St. Louis, MO and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Mark S. Deiermann is a lawyer practicing lawsuits / disputes, commercial, commercial litigation
  • Mark received a B.A. degree from University of Missouri - Columbia in 1978, and has been licensed for 45 years
  • Mark practices at Bryan Cave Leighton Paisner LLP in St. Louis, MO

Practice Areas Explained

Mark S. Deiermann's Areas of Practice

Each practice area below reflects the types of cases Mark S. Deiermann handles, with a brief overview of what that area of law covers.

Business & Corporate Law

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

Mark S. Deiermann is one of 501,317 business attorneys indexed nationally. Browse business attorneys in Missouri →

Civil Litigation

Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.

Mark S. Deiermann is one of 454,532 litigation attorneys indexed nationally. Browse litigation 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 St. Louis 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 andnue, 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 St. Louis or all attorneys in Missouri.

Frequently Asked

Common questions about Mark S. Deiermann

Where is Mark S. Deiermann's law office located?
Mark S. Deiermann's law practice is located in St. Louis, Missouri. The firm is Bryan Cave Leighton Paisner LLP. You can contact the office directly through this profile page.
What practice areas does Mark S. Deiermann handle?
Mark S. Deiermann focuses on business, litigation. Each practice area listed reflects experience handling cases of that type in Missouri.
How long has Mark S. Deiermann practiced law?
Mark S. Deiermann has 45+ years of legal experience and has been licensed since 1981.
Where did Mark S. Deiermann go to law school?
Mark S. Deiermann earned their education at (J.D., 1981); (B.A., 1978).
How can I contact Mark S. Deiermann for a consultation?
You can contact Mark S. Deiermann 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.
What awards or recognition has Mark S. Deiermann received?
Mark S. Deiermann's notable recognition includes: AV Preeminent.

Education

J.D.
University of Utah
- 1981
B.A.
University of Missouri - Columbia
- 1978

Awards

AV Preeminent

Bar Admissions

Missouri U.S. Court of Appeals, Eighth Circuit U.S. District Court, Eastern District of Missouri
Admitted: 1981

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