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  • "The BEST Attorney in Harris County!!"
  • "If You Want a GREAT Lawyer, Mark Thiessen is Your Man"
  • "The Best Lawyer in the Industry"
  • "Excellent Attorney to Have Represent You"
  • "Fantastic Lawyer!"
  • "Best DWI Lawyer out there!"
  • "Mark Thiessen Has The “IT” Factor"
  • "Amazing, Reliable and Superb Attorney! The Great Mark Deserves 100% Marks"
  • "You Cannot Compare Anybody with Mr.Mark!"
  • "Mark Eres Mi Hombre Que Luchó Por Mi Libertad y Justicia!!!"
  • "When you really need somebody to defend you I recommend you go hire Mark Thiessen."
Read Our Testimonials

100+

Not Guilty Verdicts
  • .171 Breath Test - Not Guilty
  • 0.119 Blood Test - Not Guilty
  • 0.158 Blood Test - Not Guilty
  • 0.146 Breath Test - Not Guilty
  • 0.176 Breath Test - Not Guilty
  • 0.184 Blood Test - Not Guilty
  • 0.10 Breath Test - Not Guilty
  • 0.194 Blood Test - Not Guilty
  • 0.16 Breath Test - Not Guilty
  • 0.199 Blood Test - Not Guilty
  • 0.140 Breath Test - Not Guilty
  • 0.098 Blood Test - Not Guilty
  • 0.127 Breath Test - Not Guilty
  • Not Guilty - Not Guilty
  • 0.144 Breath Test - Not Guilty
  • 0.172 Breath Test - Not Guilty
  • .24 Breath Test - Not Guilty
  • Intoxicated Assault - Dismissed
  • .17 Breath Test - Dismissed
  • .22 Blood Test - Dismissed Mid Trial
  • .16 Breath Test - Dismissed
  • 0.161 Blood Test - Not Guilty
  • No Test, No Accident - Not Guilty
  • .16 Blood Test - Not Guilty
  • .21 Blood Test - Not Guilty
  • 0.226 Blood Test - Not Guilty
  • Intoxicated Manslaughter - Not Guilty
  • DWI - Not Guilty
  • DWI Breath Test .10 - Not Guilty
  • 0.138 Blood Test - Not Guilty
See Our Results
  • ACS/CHAL Lawyer Scientist
  • Top 100 Super Lawyers in Houston - 2017-2018
  • Super Lawyers
  • DUIDLA - Board Certified
  • Texas Criminal Defense Lawyers Association (TCDLA)
  • National College for DUI Defense
  • The National Trial Lawyers Top 100
  • Avvo 10.0
  • AV Preeminent Rated by Martindale-Hubbell

Houston Criminal Defense Lawyers

Let Us Fight For You

Legal issues can impact your life in so many ways. You need a true fighter on your side to set your life back on track. At Thiessen Law Firm, our Houston trial lawyers always fight our hardest. We tell the truth about our clients’ cases because facts take precedence over promises. Honesty and integrity provide the foundation of our practice and help ensure each case ends with a positive result.

When it comes to your future, do not settle for subpar legal counsel. Choose a top-notch firm with a reputation for real results. We have secured over 100 Not Guilty verdicts in a variety of complex cases – proof of our skill and our commitment to our clients. We also have the training and experience needed to protect your rights effectively. Mark Thiessen is recognized as an ACS CHAL Lawyer-Scientist for his understanding of the science and technology behind DWI testing. He is also Board Certified in DUI Law by the DUI Defense Lawyers Association.

From complex DWI charges and painful personal injury claims to emotionally-charged family law matters, you can count on our Houston criminal attorneys to treat you like family, putting our heart and soul into the battle for your future.

Call (713) 999-3959 today or contact us online for a free, confidential case evaluation.

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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Why Choose
Thiessen Law Firm?

  • Aggressive Trial Attorneys
  • Dedicated Team to Fight for You
  • 100% Client Satisfaction
  • Free Case Evaluation
  • 24/7 Accessibility
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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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Speaking
Engagements

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  • Oct 17, 2018 State Bar of Texas: Austin, TX

    Handling Your First (or Next) DWI Case: Handling Breath/Blood Test Analysts

    Register Now
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A Texas DWI Can Cost You $15,000

Get the DWI facts no Texan should drive without, including:
  • 3 rights you can exercise when you get pulled over
  • How to save your license from suspension
  • Why you should refuse any roadside tests
  • What to say during your booking
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