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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

    An ACS-CHAL Forensic Lawyer-Scientist is someone who used validated, legitimate science to benefit others in their pursuit of justice.

  • Top 100 Super Lawyers in Houston - 2017-2018

    Our firm had been selectively chosen during Super Lawyers’ rigorous evaluation.

  • Super Lawyers

    Super Lawyers designations are reserved only for attorneys who display a commitment to excellent client experiences and consistently positive results in court, as determined during objective review by third parties, nomination by established peers.

  • DUIDLA - Board Certified

    Board certification by the DUI Defense Lawyers Association (DUIDLA) is only earned by those who score a passing grade or higher on the Board Certification Exam. At Brockmeyer Law Offices, our DUIDLA Board Certification demonstrates an exhaustive, in-

  • Texas Criminal Defense Lawyers Association (TCDLA)

    As members of the TCDLA, we are proud to be regular participants in the Association’s educational programs.

  • National College for DUI Defense

    We, along with our fellow College members, are some of the most experienced DUI defense lawyers in the nation. Only attorneys who have consistently demonstrated exceptional skill in handling DUI matters are appointed to the College.

  • The National Trial Lawyers Top 100

    We are among the nation’s most elite trial advocates, and our membership with National Trial Lawyers: Top 100 allows us to become even better through continuing legal education (CLE) programs.

  • Avvo 10.0

    A perfect score from Avvo is calculated by evaluating a firm’s experience, proven skill, track record, and client reviews.

  • AV Preeminent Rated by Martindale-Hubbell

    AV Preeminent Ratings are awarded based on outstanding peer reviews and client testimonials. This is the highest peer rating standard in the legal industry.

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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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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