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Criminal Defense

Fighting for the People of Texas and Winning

Texas Board of Legal Specialization in Criminal Law
DUI Defense Lawyers Association Board Certified
National College for DUI Defense Board Certified
Super Lawyers 2010-2019
Super Lawyers Top 100 in Houston & Texas
Lawyer Scientist
Avvo Rating
AV Preeminent
Harris County Criminal Lawyers Association
National Trail Lawyer

Houston Criminal Defense Attorney

When it comes to criminal defense, the Thiessen Law Firm is distinguished by our intricate knowledge of the law and related sciences – we take the time needed to understand every angle and aspect of the case in order to return the most favorable results to our clients. Led by the aggressive trial lawyer Mark Thiessen, the Thiessen Law Firm has the experience and knowledge necessary to fight for you in a wide area of cases, including:

I couldn’t have gone with a better law firm

I have to start off by saying how thankful I am that my case was dismissed. I never thought I would need a criminal lawyer but life happens. Mark kept me informed during the entire process. My case was rescheduled a few times, which was incredibly frustrating, but Mark kept calm. He had a …

Posted: J.W., Assault Family Violence Client
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Mark Thiessen is Board Certified in DWI Defense by the NCDD, a rare distinction that signifies his specialization and expertise in defending those accused of DWI. Mark Thiessen is also Board Certified in Criminal Law by Texas Board of Legal Specialization. This makes Mark one of only three attorneys in all of Texas that hold both of these Board Certifications and  the only attorney in America with these double Board Certifications in addition to being a ACS/CHAL Lawyer-Scientist.

But it’s not just about the credentials: Thiessen Law Firm provides results for its clients. As a Houston intoxication manslaughter lawyer, Mark Thiessen has secured “Not Guilty” verdicts for his clients, including a quadruple intoxication manslaughter case. Thiessen Law Firm has helped saved careers, as a Houston attorney for drug charges.

We’re Obsessed With Winning

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Our clients experience the utmost professionalism when it comes to their case, including 24/7 accessibility to our team. Trust your future to a team that is well-versed in the rules of evidence, DWI case law and constitutional law, as well as related scientific and technical areas including anatomy, physiology, toxicology, chemistry, computer science, biology and physics. Contact the Thiessen Law Firm today.

aggressive defense