Atty. Mark R. Thiessen

Atty. Mark R. Thiessen

Mark Thiessen was born and raised in Houston, Texas. Mr.

Houston Houston 23 yrs experience 23 year
Call (832) 930-9387 Book Appointment

Profile Summary

About Mark R. Thiessen at a glance

Mark R. Thiessen is a Trial Attorney based in Houston, Texas, practicing at Thiessen Law Firm. They have 23+ years of legal experience, licensed to practice since 2003. Their practice focuses on dui/dwi, divorce, car accidents, truck accidents, and drug crimes. Admitted to practice in Texas (2003), U.S. District Court, Southern District of Texas (2004), and Colorado (2016). Educated at South Texas College of Law (J.D., 2003) and Texas Christian University (B.B.A., 2000). Recognitions include AV Preeminent. Active member of Houston and American Bar Associations State Bar of Texas Lawyers Against Waste Houston Mariner's Club. Serands clients in Houston, TX and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Mark Thiessen was born and raised in Houston, Texas
  • Mr. Thiessen attended the Village School and St. Francis Episcopal Middle School before graduating from the Kinkaid School in 1996
  • While at the Kinkaid School, Mr. Thiessen won state in advanced acting and was captain of the tennis team
  • Mr. Thiessen then attended and graduated from Texas Christian University in 2000 with a Bachelor’s of Business Administration in Marketing
  • While at TCU, Mr. Thiessen was a member of Phi Delta Theta fraternity and on the dean’s list
  • He then came back home to Houston and continued his education at South Texas College of Law (STCL) in Houston
  • While attending STCL, Mr. Thiessen was active in mock trial, various law societies and intramural football
  • He also studied International Criminal Law at the University of Malta during the Summer of 2001
  • Additionally, Mr. Thiessen studied abroad at the BPP Law School in London, England and at the University of Hawaii
  • Studying in these unique legal environments required Mr. Thiessen to adapt to various social, cultural, ethnic and economic groups, which is evident in his personality today
  • After graduating from law school, Mr. Thiessen practiced civil law for three years in cases ranging from admiralty and maritime issues at Bell, Ryniker & Letourneau to toxic tort and personal injury claims at Brown Sims, P.C
  • He still maintains many close connections in the civil world
  • In January 2006, though, he followed his true calling to the criminal court room and became a skilled trial lawyer
  • Trichter & Murphy, P.C., hired Mr. Thiessen as an associate in January 2006, where he worked for over five years
  • There, he studied under one of the foremost legal authorities in Texas
  • Although his practice includes all areas of criminal defense, Mr. Thiessen maintains an emphasis on DWI and drugs or controlled substances
  • The trial of a DWI case dictates that on any given date, a trial lawyer must be not only well-versed in Rules of Evidence, case law pertaining to DWIs and constitutional law, but also numerous areas of science such as anatomy, physiology, toxicology, chemistry, computer science, biology and physics
  • A DWI case is the most difficult legal case to try because of the quality of adverse political sentiments against alleged drunk drivers such as Mothers Against Drunk Driving (MADD), much of the offense being videotaped and field sobriety tests that have become scientifically standardized
  • Also, many DWIs become more difficult when they are coupled with accidents that require accident reconstruction knowledge
  • injuries that occurred in accidents that require a working knowledge of anatomy, physiology and medicine
  • and chemical testing that requires breath, blood and urine
  • Clearly, for the skilled DWI trial lawyer, the defense of a citizen accused of DWI is intensely complex and requires a great deal of legal and scientific preparation
  • DWI defendants are unique in the criminal justice system and no greater opportunity exists for an innocent person to be convicted than with a DWI charge
  • Mr. Thiessen prides himself in being an aggressive trial lawyer
  • If the district attorney will not bargain or justice will not be served by allowing the client to plead guilty, Mr. Thiessen will aggressively, passionately and professionally represent you in trial
  • He has a strong reputation as a trial lawyer and works hard to maintain that status
  • Mr. Thiessen is also the youngest criminal Super Lawyer in Texas for 2013
  • Fearlessness in the courtroom is a byproduct of Mr. Thiessen’s normal routine
  • Outside the courtroom, he is an avid competitor in Brazilian jiu jitsu and muay thai
  • He is a member of BRAZIL-021 School of Jiu Jitsu and has won medals at the Atama Open, Abu Dabai Combat Club, Fight to Win, IBJJF Houston International Open and the Grappler’s Quest Tournament
  • He is also a member of Team Hoger Muay Thai and is a 2010 Warrior Dash finisher
  • Mr. Thiessen is also 2012 Color Run finisher and two time 2013 Tough Mudder finisher

Practice Areas Explained

Mark R. Thiessen's Areas of Practice

Each practice area below reflects the types of cases Mark R. Thiessen 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.

Mark R. Thiessen is one of 29,976 dui/dwi attorneys indexed nationally. Browse dui/dwi attorneys in Texas →

Divorce

A divorce attorney guides you through property division, spousal support, custody, and the final decree — contested or uncontested.

Mark R. Thiessen is one of 50,487 divorce attorneys indexed nationally. Browse divorce attorneys in Texas →

Car Accidents

Hurt in a car crash? Car accident lawyers fight insurance companies for fair compensation — free consult, no fee unless you win.

Mark R. Thiessen is one of 36,807 car accidents attorneys indexed nationally. Browse car accidents attorneys in Texas →

Truck Accidents

Mark R. Thiessen is one of 4,975 truck accidents attorneys indexed nationally. Browse truck accidents attorneys in Texas →

Drug Crimes

Mark R. Thiessen is one of 6,966 drug crimes attorneys indexed nationally. Browse drug crimes attorneys in Texas →

Jurisdictional Context

Why local counsel matters in Texas

Practicing law in Texas. Legal matters in Texas are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Houston are typically filed in the local municipal court or the appropriate Texas state district court, depending on subject matter and amount in controversy. An attorney licensed in Texas 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 Texas courts without local counsel or pro hac vice admission.

Looking for additional Texas attorneys? Browse all attorneys in Houston or all attorneys in Texas.

Frequently Asked

Common questions about Mark R. Thiessen

Where is Mark R. Thiessen's law office located?
Mark R. Thiessen's law practice is located in Houston, Texas. The firm is Thiessen Law Firm. You can contact the office directly through this profile page.
What practice areas does Mark R. Thiessen handle?
Mark R. Thiessen focuses on dui/dwi, divorce, car accidents, truck accidents, drug crimes. Each practice area listed reflects experience handling cases of that type in Texas.
How long has Mark R. Thiessen practiced law?
Mark R. Thiessen has 23+ years of legal experience and has been licensed since 2003.
Where did Mark R. Thiessen go to law school?
Mark R. Thiessen earned their education at (J.D., 2003); (B.B.A., 2000).
How can I contact Mark R. Thiessen for a consultation?
You can contact Mark R. Thiessen 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 R. Thiessen received?
Mark R. Thiessen's notable recognition includes: AV Preeminent.

Education

J.D.
South Texas College of Law
- 2003
B.B.A.
Texas Christian University
- 2000

Awards

AV Preeminent

Bar Admissions

Texas
Admitted: 2003
U.S. District Court, Southern District of Texas
Admitted: 2004
Colorado
Admitted: 2016

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