Dennis Chassaniol - Chassaniol & Marty, LLC

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Dennis Chassaniol

Chassaniol & Marty, LLC

5500 Mexico Road Suite 200

St. Charles, MO 63376


Practice Areas
  • Personal Injury
  • Criminal Law
  • DUI Defense
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Mr. Dennis Chassaniol’s practice primarily focuses on criminal defense and general practice. He has a strong passion to help the individual through challenging times in the legal system. Mr. Chassaniol has the experience and skill needed for just results in our criminal system.

Mr. Chassaniol began his legal career as a State Prosecuting Attorney. This is where he learned how the side of law enforcement prepares a case to be prosecuted. He gained valuable experience preparing cases and trial work. However, he could not escape his desire to defend the accused.

Mr. Chassaniol began the second phase of his career focusing on criminal defense in St. Charles County and the surrounding Counties. He continues to aggressively represent the accused with compassion and preparation.

Beginning in 2015, Mr. Chassaniol has a partnership in the firm of Chassaniol and Marty. He remains focused on Criminal Defense and his firm represents individuals harmed in accidents and in the work place. It is very important that the people of our community continue to have quality representation in challenging times.

Besides his work in his Law Firm, Mr. Chassaniol sits as a Municipal Judge in O’Fallon, Cottleville, Dardenne Prairie, Lake St. Louis and Winfield. This area of his practice gives him a different view of the legal system and he enjoys serving these communities.

Mr. Chassaniol was raised in St. Charles County and is very involved in the Community raising his four children with his wife. Please contact Mr. Chassaniol so you can meet to discuss your challenging legal issue.


  • University of Missouri – Columbia, B.A. 1991
  • Western Michigan University Cooley Law School, 1995
  • Licensed in Missouri and 8th Circuit Eastern District of Missouri

Some of the types of charges I take care of are:

  • Drug Charges – Possession – Paraphernalia
  • Theft – Robbery
  • Rape Charges – Sex Crimes
  • Driving While Intoxicated – Driving While Revoked or Suspended
  • Driver’s License Issues – Traffic Tickets
  • Limited Driving Permits
  • Reinstatement after a 5 or 10-year loss of license

Law School: University of Michigan
Admitted to Bar:
Practice Areas: Personal > Traffic Violations
Personal > Personal Injury
Personal > Criminal Law
Personal > DUI Defense
Gender: Male
Status: Married
City of Residence: St. Charles
Home Town: St. Charles
Home State: MO
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