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AGGRESSIVE HOUSTON DWI LAWYERS

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Google 240+ 5 star rating, Avvo 230+ 99% rating Mark Thiessen
Company Awards: Super Lawyers, AV Preeminent Martindale-Hubbell Lawyer Rating, The National Trial Lawyers Top 100, Avvo Superb 10.0 Rating
Mark Thiessen

The only DWI Attorney Selected To:

Awards Top 100 HTX TX

Notable Houston DWI Victories

not guilty

Intoxication Manslaughter | State v. G.G.

Harris County 248th

8/30/24

While the Not Guilty verdict may have been in our client’s favor, there are truly no winners in Intoxicated Manslaughter cases. The jury was not happy to render a verdict of Not Guilty but, they followed the law and had doubts about intoxication. The jury took their oath very seriously and stayed true to their doubts, not letting their emotions overcome a just verdict. Thank you to that jury for giving our client his life back.

Our client was speeding and texting while driving. Unfortunately, he had a tragic accident killing another man by rear ending him at a stop light.  The blood test of .21 residual blood and .19 consent blood draw just didn’t add up.  Only 1 witness/police officer said he smelled alcohol on our client out of 15 witnesses. None of the witnesses said he had even slurred speech, which the hospital video confirmed. He never asked to use the restroom once. He was given fentanyl and had a head injury. He was confused and out of it, but not slurred or drunk. The blood just didn’t add up. Amanda Culbertson did a great job explaining the problems with lavender topped tubes, serum samples, and pulling cold blood. Don Egdorf helped the jury understand what a proper police investigation should have entailed and what voluntary consent should look like. The DAs were professional and tried a great case. At the end of the day, there was just too much doubt for intoxicated manslaughter.

Thank you also to the Judge for giving us time and patience to try a very difficult and emotional case. Thank you to my office for preparing this case, having everything in order, and holding down the fort while we were out for 2 weeks. Lastly, and most importantly, thanks to God for aligning all the stars and putting the right people in the right seats after 2,295 days. We sincerely hope that both families can find peace and closure after this tragic accident.

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Texas Board of Legal Specialization in Criminal Law
DUI Defense Lawyers Association Board Certified
National College for DUI Defense Board Certified
Super Lawyers 2013-2024
Super Lawyers Top 100 in Houston & Texas
Lawyer Scientist
Avvo 10/10 Rating
Avvo Clients' Choice Award
Board Certified Advocate in Criminal Trial Law by the NBTA Foundation
AV Preeminent
TCDLA
Harris County Criminal Lawyers Association
National Trail Lawyer
Super Lawyers Rising Star 2010-2013
Mark Thiessen

Mark Thiessen

Houston DWI & Criminal Law Specialist

“I’m a 3x Board Certified, trial-tested DWI Specialist focused on fighting for my client's freedom. If you hire our Houston DWI Law firm, we're available 24/7, because, at the end of the day, we work for you. As one of only three attorneys in all of Texas to be Board Certified in DWI Defense by NCDD and in Criminal Law by Texas Board of Legal Specialization, my clients can count on specialized, expert representation that most firms simply can’t deliver.”

What to expect?

Thiessen Law Firm. Well-known for both award winning Houston DWI Lawyers and aggressive trial-tested criminal defense techniques, we fight like no other, for your DWI case. Our trial attorneys not only fight for positive results, we also care deeply about the overall well-being of our clients.

Why Choose Thiessen Law Firm?

  • Proven Houston DWI Lawyer
  • Aggressive Criminal Defense Attorney
  • Board Certified in Criminal Law by Texas Board of Legal Specialization
  • Board Certified in DWI Defense Law by NCDD
  • ACS/CHAL Lawyer Scientist
  • The ONLY DWI lawyer to be selected to Top 100 Super Lawyers in Texas (2019-2023) and Houston (2017-2023)
  • Free DWI & Criminal Case Evaluation
  • No Hourly Rates
  • 24/7 Accessibility
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Houston DWI & trial lawyers that fight for you in Houston and all Texas counties

Our Houston DWI Attorneys always fight our hardest. We tell the truth about your DWI or DUI case, and facts take precedence over promises. We hold honesty and virtue in highest regard and it is the foundation of ensuring your DWI or criminal defense case ends with a satisfying, positive outcome.

When you get a Houston DWI, DUI or other criminal charge in Harris County, your life is changed, no matter the verdict. At Thiessen Law Firm, you will be represented by a Houston DWI lawyer who will ensure you’re able to continue on with the life you want. You’ll never feel forced into taking a deal that you don’t want, or accepting terms you don’t fully understand. Mark Thiessen isn’t just a top Houston DWI lawyer. He’s also recognized as an ACS CHAL Lawyer-Scientist for his efforts to understand the science and technology behind DWI testing. This investment in his education and training provides clients with the knowledge needed to fight for their rights effectively and fairly.

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Not Guilty Verdicts

Client Testimoanials

Speaking Engagements

Awards & Honors

Mark Thiessen's Publications

You’ve got 15 days to save your license. Choose a lawyer who can defend it.

Thiessen Law Firm is ready to protect your life.

At Thiessen Law Firm, we prioritize your peace of mind and fight to protect you from injustices. Here, you’re more than just a case number, and you don’t have to face the severity of the justice system alone. Contact us today to schedule an Administrative License Revocation hearing, save your license, and preserve your rights.

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Latest DWI & Criminal Defense News

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December 5, 2024 . 9 min read

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December 4, 2024 . 6 min read

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December 3, 2024 . 7 min read

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Mark Thiessen

Mark Thiessen

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In The Media

In The Media
www.lubbockonline.com

Jurors find woman not guilty of intoxication manslaughter in fatal West Lubbock crash

The defense attorney for a 23-year-old woman said a flawed Lubbock police crash investigation provided enough reasonable doubt for a 12-member jury to find his client not guilty in a fatal 2014 West Lubbock wreck.

Read the full story

Speaking Engagements

As an attorney selected as a Texas Super Lawyer, Mark Thiessen has consistently set high standards in his field since establishing his firm. His scientific investigation process & comprehensive list of victories has brought him to the forefront of national recognition as he is sought by industry leaders & legal organizations to deliver trial strategy seminars.

Houston, Texas

TCDLA Top Gun Advanced DWI CLE – Breaking Down Blood Testing for Lawyers

San Antonio, Texas

State Bar of Texas Advanced Criminal Law CLE – Cross Examining the SFSTs

Houston, Texas

Harris County Managed Assigned Counsel (MAC)/ SFSTs and the Disconnect Defense

Happy Clients

Fantastic Lawyer

I would HIGHLY recommend hiring Mark Thiessen as your attorney for any criminal case that you have received in the Harris County area. He is extremely knowledgeable of the court system and what actions can be taken pre-trial in order to have the best outcome at your court date. I was put on probation for a DWI a year previous to hiring Mark as my attorney. I failed to complete the requirements in order to get off of probation. My probation was revoked and sent back to the courts. That's when I hired Mark. He told me to go complete the rest of the requirements for probation and get myself a court date. When we got to court he persuaded the judge not only to dismiss my probation, but dismiss it successfully. In court he made small talk with the judge and prosecutor which told me that he k...

Preston

DWI Client

Mark Thiessen is a criminal defense all-star. If he can’t get you a win, nobody can.

"Simply put, Mark Thiessen is a criminal defense all-star. If he can’t get you a win, nobody can. I’ve worked with Mark and his team on two very different cases, and both times I’ve been blown away by the level of honesty, strategy, and respect that Thiessen Law Firm brings to the table. You can feel the difference the second you step in the courtroom with Mark by your side. The time he has taken to build relationships and earn respect is clear. He knows how to push the envelope while still being respectful of the system when it matters. Best of all, he knows where the “win” is, even when “not guilty” isn’t possible. He won’t send you to trial when he knows it won’t work, and he won’t just roll over and charge you for the same lame deal everyone gets. Mark and ...

Mark Thiessen is a Jedi Master of his craft

"Mark Thiessen is a Jedi Master of his craft. Mark and his team have a keen and tactical approach to handling your case, yet still manage to maintain a lot of empathy in their communication with you. A rare combination indeed. They definitely made this process of navigating the court system as smooth as it could possible be. Things such as answering my texts late at night even on the weekends, and being there in person at the office for meetings were quite clutch. I am more than glad I went with Mark and his firm when I was a lost pup browsing the endless aisles of law firms showing up via google, ads, family recommendations, etc. Cheers to the Thiessen Law Firm."

I knew within 10 seconds after meeting Mark that he was going to be the attorney representing me in my case.

If you do not hire Mark Thiessen to represent you in your DWI case, then you will be making a huge mistake that could personally and professionally follow you around for the rest of your life. I aggressively shopped law firms online and interviewed numerous attorneys before I met with Mark. I knew within 10 seconds after meeting Mark that he was going to be the attorney representing me in my case. Mark is a very knowledgeable, tough, no nonsense kind of guy. I cannot begin to tell you how important this is because the legal process is a tough roller coaster ride that will beat you down. Knowing that Mark was watching my back thru the process was a huge help beyond any description. Even with Mark leading the charge, I honestly thought my chances of receiving anything less than a fu...

My case is now dismissed and I can finally put this all behind me.

I am a professional business leader part of a Fortune 1,000 company. A year and a half ago my mother has just diagnosed with stage four ovarian cancer. At 8 pm on a Thursday night my stepdad called and told me that she had been rushed to the medical center. I made a terrible decision!! To get in my car to be there for my mother. I was pulled over and charged with Driving while intoxication. Never being faced with anything like this, I did not where to turn for help. I called a friend that had gone through something very similar in the past and she without hesitation told me to call Mark, she gave me his cell phone number and within 24 hours I was sitting in his office. He was very honest and sympathetic to my situation. He took my case and we went through the process. He always t...

His knowledge of the legal system was astounding

After being arrested for a first time DWI, I felt scared, lost, and worst of all alone. I quickly started asking around and reading reviews. Time and time again the name Mark Thiessen was the main constant to every conversation or search. He, himself, called me back in less than 24-hours, set up a consultation the next day, answered all my outrageous questions patiently, and proceeded to give me an overview of how the process would play out. His knowledge of the legal system was astounding. Everyone knows DWI’s will come with a price tag as well. But I felt the price and payment plan were very reasonable, especially when your talking about your own future. You get what you pay for and WOW! I got that and even more through the process. Some people’s minds work systematically, if A happen...

This is the only lawyer you should choose for your peace of mind

Good evening, it took me a long time but finally I can actually express the sentiments I felt from the beginning of my nightmare to the end of it with leaps of joy. This is not a paid comment or was I ever asked to do it, from the beginning where you feel like the whole world is dark and you don’t see any light at the end of the tunnel, everyone at the Thiessen Law Firm welcomed me and my family but most importantly they were clear in their answers to the many questions I had. Never doubted on a positive outcome as I could see their expertise and the way they would be relaxed and calm on going about their business as if you were watching a perfectly synced movie! Ultimately Mr. Thiessen, Mr. Denuna and Ms. Bedru, all came through for my case and the most incredible thing was ha...

Excellent Attorney to Have Represent You

Because of the seriousness of my case (serious for me), I had been researching and meeting with many different lawyers in the area. I felt like my life was unfairly ruined; I even considered pleading guilty just because it seemed the odds were against me. What made me choose Mark was not only his positive reviews and great record, but when I first met him he was confident, honest, straightforward and very knowledgeable. He definitely knows what he's doing and will fight for you. Mark will not fudge or sugarcoat the situation to you. While some people may take it as not caring, it is exactly was is needed in this type of environment. I appreciated that he was very honest and gave all the details to keep me informed throughout the entire ordeal. I ended up getting both Mark and Jed Sil...

Mark Thiessen Has The “IT” Factor

Often times we hear about how Michael Jordan or Tom Brady just have/had that "IT" factor. In the sporting world the "IT" factor will win you games and championships. In the work world the "IT" factor will earn you praise, money, pretty girls/or guys if that’s your preference and MONEY..... When it comes to the LAW and the "IT" factor; it can mean your freedom or justice. We often take our freedoms for granted and find ourselves on the other side of the law. In that case we have to rely on a lawyer to defend our rights when we or someone else violates our freedoms. In my case, my freedom was violated when an intoxicated group of people decided to gang up on me at a house party in what I would consider a nice part of Houston. Never would I have thought that I would have to defend my freed...

Amazing, Reliable and Superb Attorney! The Great Mark Deserves 100% Marks

Mark achieved everything that I thought wasn't possible. He overcame every obstacle that the DA threw at him, approached the case with confidence, and ultimately claimed a victory for me. I am incredibly grateful for Mark Thiessen.

You Cannot Compare Anybody with Mr.Mark!

I was accused by my own wife. It was a painful incident happened in my life. She said to the police that I was threatening to kill her and beaten her. She did this to be because she was looking for lot of money from me and I couldn’t give her the money. She was so bad that she even made proofs with the doctors. There was witness from Doctors and nurses and even some voice recordings. She allowed the doctors and nurses even to record our loud conversions. There were lot of accuses on me and the case was very strong. But in front of Mark nothing can stand. I had just two resets and the time. The first one was just a day adjustment and the next one was just 2 weeks. On the second reset, I went to the court and heard shocking news. My wife again called the court and said that I was threa...

Mark eres mi hombre que luchó por mi libertad y justicia!!!

La desafortunada noche que por causa de un accidente automobilistico, fue detenida, evaluada por un oficial de la policia y luego arrestada bajo cargos erroneos de Manejo en Estado de Ebriedad (DWI) o bajo la influencia de alcohol, fue la peor noche de mi vida. Al haberte resistido a tomar la prueba de respiratoria evidencial en un fin de semana el cual era digtado como "Sin Derecho a Refutir" dicha prueba, determinó el derecho del estado a una prueba de sangre al ser encarserada. Estos resultados de sangre fueron sumamente altos al ser recibidos, lo cual significaron el problema mas transcendente de mi vida, afectando mi carrera profesional al punto de descenso absoluto, y descalificame como aplicante para recibir mi ciudadania Americana, la cual ya era factible por mi tiempo siendo...

Choosing a Houston DWI Lawyer

If you or a loved one are fighting a Houston DWI, it may be tempting to search for cheap DWI lawyers in Houston, TX. Don’t gamble with your freedom and reputation, even a DWI in Texas, first offense can be life-altering.

In fact, every DWI and criminal offense is serious: DPS surcharges, intoxication manslaughter, a BWI in Houston. Look beyond a DWI lawyer in Houston and their cost, you need a Houston DWI attorney who wins.

For example, many websites may claim to be the best DWI lawyer in Texas. But how many of those DWI attorneys have beat a quadruple intoxication manslaughter charge? Thiessen Law Firm has. In fact, our Houston DWI lawyers have beaten intoxication manslaughter charges, DWI blood tests, DWI breath tests, and have even seen successful outcomes where a client admitted to being drunk on video.

In addition to being a Super Lawyer and ACS-CHAL Lawyer Scientist, since July 14, 2022, DWI Specialist Mark Thiessen has been the only attorney in America who is Triple Board Certified in the following areas:

  • Criminal Law by the Texas Board of Legal Specialization - 12/31/2018
  • DUI Defense by the National College for DUI Defense as approved through the American Bar Association - 7/14/2022
  • DUI Law by the DUI Defense Lawyers Association - 4/26/2018
  • Board Certified Advocate in Criminal Trial Law by the NBTA Foundation - 8/27/2021
Mark is also rated a 10.0 Superb Avvo-rated lawyer with 99% client satisfaction.

Don’t worry about finding a “DWI lawyer near me”, Thiessen Law Firm fights DWI in Texas, all across the state. Need a DWI Lawyer in Galveston County? The team of Houston DWI attorneys at Thiessen are ready to fight for you.

Get a Houston DWI team with winning experience on your side, request a free consultation below.

Free DWI & Criminal Case Consultation

Call 713.864.9000 or fill out the form below for a free consultation.

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