Atty. Dennis Robert Chassaniol

Atty. Dennis Robert Chassaniol

Dennis Robert Chassaniol is a lawyer practicing domestic violence, dui & dwi, criminal defense and 3 other areas of law. Dennis received a B.A. degree from University of Missouri in 1991, and has been licensed for 31 years.

St. Peters St. Peters 31 yrs experience 31 year
Call (314) 476-6064 Book Appointment

Profile Summary

About Dennis Robert Chassaniol at a glance

Dennis Robert Chassaniol is a Member based in St. Peters, Missouri, practicing at Chassaniol & Marty. They have 31+ years of legal experience, licensed to practice since 1995. Their practice focuses on dui/dwi, personal injury, criminal defense, family law, and estate planning. Admitted to practice in Missouri (1995). Educated at Thomas M. Cooley Law School (J.D., 1995) and University of Missouri (B.A. History, 1991). Recognitions include BV Distinguished. Serands clients in St. Peters, MO and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Dennis Robert Chassaniol is a lawyer practicing domestic violence, dui & dwi, criminal defense and 3 other areas of law
  • Dennis received a B.A. degree from University of Missouri in 1991, and has been licensed for 31 years
  • Dennis practices at Chassaniol & Marty in St. Peters, MO

Practice Areas Explained

Dennis Robert Chassaniol's Areas of Practice

Each practice area below reflects the types of cases Dennis Robert Chassaniol handles, with a brief overview of what that area of law covers.

DUI / DWI Defense

Find experienced DUI and DWI defense attorneys near you. Compare verified profiles, read client reviews, and consult about your case for free.

Dennis Robert Chassaniol is one of 29,976 dui/dwi attorneys indexed nationally. Browse dui/dwi attorneys in Missouri →

Personal Injury

Personal injury attorneys help accident victims recover compensation for medical bills, lost wages, and pain & suffering. Most work on contingency — no fee unless you win.

Dennis Robert Chassaniol is one of 264,852 personal injury attorneys indexed nationally. Browse personal injury attorneys in Missouri →

Criminal Defense

A criminal defense attorney protects your rights from arrest through trial. Find experienced lawyers handling DUI, drug, federal, theft, and violent-crime charges.

Dennis Robert Chassaniol is one of 214,270 criminal defense attorneys indexed nationally. Browse criminal defense attorneys in Missouri →

Family Law

Family law attorneys handle divorce, child custody, child support, adoption, prenups, and protective orders. Find verified family lawyers near you.

Dennis Robert Chassaniol is one of 187,066 family law attorneys indexed nationally. Browse family law 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.

Dennis Robert Chassaniol is one of 226,536 estate planning attorneys indexed nationally. Browse estate planning 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. Peters 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. Peters or all attorneys in Missouri.

Frequently Asked

Common questions about Dennis Robert Chassaniol

Where is Dennis Robert Chassaniol's law office located?
Dennis Robert Chassaniol's law practice is located in St. Peters, Missouri. The firm is Chassaniol & Marty. You can contact the office directly through this profile page.
What practice areas does Dennis Robert Chassaniol handle?
Dennis Robert Chassaniol focuses on dui/dwi, personal injury, criminal defense, family law, estate planning. Each practice area listed reflects experience handling cases of that type in Missouri.
How long has Dennis Robert Chassaniol practiced law?
Dennis Robert Chassaniol has 31+ years of legal experience and has been licensed since 1995.
Where did Dennis Robert Chassaniol go to law school?
Dennis Robert Chassaniol earned their education at (J.D., 1995); (B.A. History, 1991).
How can I contact Dennis Robert Chassaniol for a consultation?
You can contact Dennis Robert Chassaniol 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 Dennis Robert Chassaniol received?
Dennis Robert Chassaniol's notable recognition includes: BV Distinguished.

Education

J.D.
Thomas M. Cooley Law School
- 1995
B.A. History
University of Missouri
- 1991

Awards

BV Distinguished

Bar Admissions

Missouri
Admitted: 1995

Reviews

4.3
3 Review
5 0
4 0
3 0
2 0
1 0
These reviews belong to platform users; they do not constitute advertisement or promotion for the attorney. Opinions are published for informational purposes only.

No reviews yet.