Atty. Mark Byron Johnston

Atty. Mark Byron Johnston

Mark Byron Johnston is a lawyer practicing legislative practice, government relations, health care. Mark received a B.S. degree from Missouri University in 1977, and has been licensed for 40 years.

St. Louis St. Louis 40 yrs experience 40 year
Call (314) 788-3810 Book Appointment

Profile Summary

About Mark Byron Johnston at a glance

Mark Byron Johnston is a Govt. Affs. Coun. based in St. Louis, Missouri. They have 40+ years of legal experience, licensed to practice since 1986. Their practice focuses on government and health care. Admitted to practice in Missouri (1986) and Illinois (1987). Educated at Missouri University (J.D., 1985) and Missouri University (B.S. Missouri, 1977). Serands clients in St. Louis, MO and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Mark Byron Johnston is a lawyer practicing legislative practice, government relations, health care
  • Mark received a B.S. degree from Missouri University in 1977, and has been licensed for 40 years
  • Mark practices in St. Louis, MO

Practice Areas Explained

Mark Byron Johnston's Areas of Practice

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

Government & Administrative Law

Attorneys for administrative law, agency hearings, government contracts, licensing, and public benefits.

Mark Byron Johnston is one of 132,225 government attorneys indexed nationally. Browse government attorneys in Missouri →

Health Care Law

Health care attorneys for HIPAA, Medicare, Medicaid, regulatory compliance, and medical licensing matters.

Mark Byron Johnston is one of 66,735 health care attorneys indexed nationally. Browse health care 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 Byron Johnston

Where is Mark Byron Johnston's law office located?
Mark Byron Johnston's law practice is located in St. Louis, Missouri. You can contact the office directly through this profile page.
What practice areas does Mark Byron Johnston handle?
Mark Byron Johnston focuses on government, health care. Each practice area listed reflects experience handling cases of that type in Missouri.
How long has Mark Byron Johnston practiced law?
Mark Byron Johnston has 40+ years of legal experience and has been licensed since 1986.
Where did Mark Byron Johnston go to law school?
Mark Byron Johnston earned their education at (J.D., 1985); (B.S. Missouri, 1977).
How can I contact Mark Byron Johnston for a consultation?
You can contact Mark Byron Johnston 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.
Missouri University
- 1985
B.S. Missouri
Missouri University
- 1977

Bar Admissions

Missouri
Admitted: 1986
Illinois
Admitted: 1987

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