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  • The BEST attorney in Harris County and probably one of the best in the nation."
  • If you want a GREAT lawyer, Mark Thiessen is your man."
  • The Best Lawyer in the Industry"
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100+

Not Guilty Verdicts
  • .171 Breath Test - Not Guilty
  • 0.119 Blood Test - Not Guilty
  • 0.158 Blood Test - Not Guilty
See Our Results

Trial-Tested & Proven Criminal Defense for Houston & Harris County

About the Firm

If you’ve been charged with a crime, you need an experienced and aggressive criminal defense team whose number one priority is positive results for YOU.

At Thiessen Law Firm, our expert and award-winning attorneys will take the time to understand every single aspect of your case and fight hard for a dismissal or favorable deal. We do not back down if a criminal trial is necessary, and we will make sure you do not accept a deal that you do not want.

As one of Houston and Harris County’s most distinguished criminal defense law firms, Thiessen Law Firm emphasizes quality over quantity, and is dedicated to the needs of each client. As soon as you hire us, we are available to you 24 hours a day, 7 days a week. You’ll even have the personal cell phone numbers of everyone working on your case.

Meet Our Legal Team

As one of Houston’s most distinguished criminal defense firms, Thiessen Law Firm emphasizes quality over quantity. We will get to know your case better than anyone and will utilize every tool at our disposal to secure the results you need. We are dedicated to your needs – 24 hours a day, 7 days a week. As soon as you hire us, you will receive the direct contact information on everyone on your case.

Meet Our Team
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We Meticulously Prepare & Fight with Strength & Heart

Thorough investigation is a hallmark of Thiessen Law Firm. We check every witness’s story from every angle, we understand the forensics that affect your case, we prepare every nuance of our presentation, and when the time comes, we fight with strength and heart.

We are consummate professionals. If you have ever met with another criminal defense team, then you will notice the difference in the way Thiessen Law Firm handles your case from the very first meeting. At our firm, we value honesty, we value dedication, and we value every client.

A Reputation for Success

Our reputation speaks for itself, and the overwhelmingly positive testimonials on our website will show how we have made miracles happen for accused individuals in desperate need of help. If you want a law firm who will fight for your protection, your freedom and your family, then you must call Thiessen Law Firm.

Don’t settle for anything less than the most skilled, most experienced, most respected criminal defense law firm in Houston and Harris County. Call (713) 864-9000 for a free consultation now.

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In the Community

Over the past years, Thiessen Law Firm has taken pride in giving back to the community and has donated to a number of non-profits and events, such as those featured below. If your non-profit or charity is interested in sponsorship from Thiessen Law Firm, contact us today!

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