PRO

Licensed for 22 years

DUI and DWI Lawyer at Houston, TX
Practice Areas: DUI & DWI, Criminal Defense, Personal Injury

Virtual Consultation Available

Free Consultation

About Mark

Biography

The ONLY ONE IN THE WORLD Quadruple Board Certified in Criminal Law, DUI Defense, DUI Law, and Criminal Trial Advocacy. Honestly, if I can't win your case, I don't know who can. The ONLY DWI attorney to Make Top 100 Super Lawyers in Houston and/or TX. I've personally won 140+ Not Guilty Verdicts!

The ONLY ONE IN THE WORLD Quadruple Board Certified in Criminal Law, DUI Defense, DUI Law and Criminal Trial Advocacy. Honestly, if I can't win your case, I don't know who can. Trial tested and proved! Specializing in Criminal Defense and DWI Defense.

The ONLY ONE IN THE WORLD Quadruple Board Certified in Criminal Law, DUI Defense, DUI Law and Criminal Trial Advocacy. Honestly, if I can't win your case, I don't know who can. Set it for trial! Specialize in Criminal and DWI Defense. I fight!

WE FIGHT GIANTS! We aren't scared of big insurance. If they won't pay policy limits, then we take them to trial and crack them open for maximum payment. Wait until you see us in trial!

Practice Areas

Criminal Defense 40%

Intoxication Manslaughter/ Intoxication Assault/ Aggravated Assault/ Assault Family Violence/ Possession of Controlled Substance/ Prostitution/ Arson/ Murder/ Theft/ Burglary/ Forgery/ Evading Arrest/ Criminal Mischief

21 years | 200 cases

40%

DUI and DWI 40%

Driving While Intoxicated (Felony to DWI 1st); Driving Under the Influence; Boating While Intoxicated; Reckless Driving; Obstruction of a Highway; Deadly Conduct; Public Intoxication

21 years | 500 cases

40%

Personal Injury 20%

20%

Fees and Rates

Cost

Free Consultation

$0 first 90 minutes

Payment Methods

Cash
Check
Credit Card

Awards

2022 2021 2020

...

+ 10

Licenses

Licensed in Colorado for 9 years

State: Colorado

Acquired: 2016

Active

No misconduct found

Licensed in Texas for 22 years

State: Texas

Acquired: 2003

Eligible to Practice in Texas

No misconduct found

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Location

Thiessen Law Firm

(713) 864-9006

Fax

(281) 612-5980

Mobile

733 E. 12 1/2 Street, Houston, TX, 77008

thetexastrialattorney.com

Message Get Directions

The Thiessen Law Frim

914 Waters Ave, Aspen, CO, 81611

thetexastrialattorney.com

Message Get Directions

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Gallery

Online Presence

Other places you can find Mark online.

Mark Ryan Thiessen's Reviews

Overall Rating
This is an aggregated review score of Avvo and Lawyers.com reviews.

4.6 /5.0

237 Client Reviews

Avvo

5.0

(232)

Lawyers.com

4.2

(5 )

See client reviews from Lawyers.com

Showing 46 - 50 of 54 reviews | Communication Style

Posted by Amanda | July 15, 2010 | DUI & DWI

The BEST DUI Attorney in Houston!

Mark Thiessen is one of the most responsive and knowledgeable DWI attorneys in Houston and will absolutely do what needs to be done to get the job done! The first time I met Mark was the day after my DWI when he met me at his office (on a Saturday morning) on extremely short notice. He had prior pe...rsonal engagements that day as well as the following week/weekend and not only was he always available to me - night or day (sorry, Mark : ) ) - but, as I had never been through anything like this before, was extremely patient, understanding and informative. I met with multiple (five) attorneys prior to hiring Mark and chose him primarily because he was the one that ALL five knew and respected. Now that all is said and done I simply could not imagine having gone through this with anyone else. Not only is he extremely knowledgeable but the personal level of care and availability that he offers and his "get it done" attitude are truly not only something that one in this situation would hope for in an attorney but that really make such a difference when going through something like this (on one of my court dates he had EIGHT clients in different courts and still found time to spend time with me after). I just can't say enough - thank you so much, Mark for all you did for me - I just can't even find words to describe how grateful I am for all you did!

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Posted by anonymous | May 19, 2010 | DUI & DWI

Successful

When I was charged a couple of years ago with a DWI, I was so scared and confused. Fortunately, some former clients of Mark and his firm had already experienced a high success rate utilizing their services so it was an easy decision for me to make when I decided to hire Mark. He knew what he was do...ing and he kept me from worrying. He always answered any questions I had. I highly recommend Mark Thiessen.

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Posted by anonymous | April 08, 2010 | DUI & DWI

No One Else to Call...

Mark Thiessen represented me in my 2007 DWI case. It was my second; and I refused to answer questions or perform any roadside tests, which meant I had a tough road ahead of me. I initially went with a different attorney, but a good friend suggested I speak to Mark and hear his take on the cas...e. After listening to Mark explain his strategy with such knowledge and confidence; I was sold and made the change to have him represent me. Mark’s courtroom demeanor and personality are unmatched. Mark’s close working relationship with the courts is an immense asset for him. After several resets, Mark found an error in the officer’s report and had my case dismissed. Mark’s high-win percentage, as recently reported in the Houston Press, speaks for itself. I have, and will continue to recommend Mark to my friends and others who have had to deal with this unfortunate situation. If you’ve been arrested for DWI, there really is no one else to call.

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Posted by anonymous | April 04, 2010 | DUI & DWI

A Ringing Endorsement from A Lawyer's Harshest Critic [A fellow Lawyer]

Anyone reading about lawyers should want to know the results first. Mark Thiessen took on a case that was beset with difficulties all along the way and got a dismissal. That's a home run once charges are filed. When bad luck struck, I already knew the lawfirm I would contact: T & M was succ...essful in dismissing three friends' DWIs (3 for 3) so their reputation preceded them. Lawyers monitor and evaluate the progress of their fellow law firms and peers vigilantly. Yet still, some of the details of progression of the individual lawyer can be easily overlooked under the shadow of the "Firm name" they work for. What I found out when Mark Thiessen became counsel for my case was that right under my nose he had become amongst the elite lawyers in criminal defense; especially handling DWI claims. When you face criminal charges, it is an understatement to say you want a lawyer that is supremely confident and utterly fearless... If they fear trial then no DA will ever fear them. Mark has shown a willingness to take his cases to trial... and the ability to win them as the rule and not the exception. He must be nearing or over 20 trial wins with less losses than he can count on one hand. The importance of this cannot be underestimated. From the beginning he kept even a lawyer like me at ease in a stressful situation... He has that intangible in inspiring his clients' confidence in him. This does not mean he will blow smoke where the sun doesn't shine. To a lawyer that has the opposite effect. He gives it to you straight at each phase of the litigation that, based on the evidence and other factors at work, what he sees as the most favorable outcomes and explains how he plans to get there. He knows his turf. He knows how each judge operates, which courts have which DAs- who can be reasoned with, who are the stronger and weaker trial attorney DAs, what willingness they have shown to be flexible. He knows his law. No matter what the circumstances surrounding your case should be, he will not fail to raise the appropriate motions to give you as much as the law allows in the process. While some have settled with suspended licenses he petitioned for restrictive measures that would still allow me to drive freely if I didn't abuse the privilege. Once all the evidence had come in and it was time for the DA to make a decision as to whether to take my case to trial or dismiss it, in hindsight I will admit that the decision was a borderline-close call that could have gone either way for the DA. As a lawyer I am keenly aware of the reasons they decided to dismiss the charges against me. (1) Thiessen not only is willing to but enjoys taking cases to trial. If you hire a criminal attorney, you better hire one that likes "the fight". DAs like the fight and will bully on any lawyer that is shy to match that willingness. (2) When Thiessen does fight, he usually wins. When the DAs see any reasonable doubt in the case, they know which lawyers will take that and run with it. The DAs see enough cases to know how it will be likely to end up given the case and the lawyer. Most DAs in this county have been on the losing end of a trial against him. DAs know that if it is a "borderline" case, odds are he will find a way to win it come trial. (3) Thiessen shows respect and courtesy to his adversary No matter how good a criminal lawyer may be if he does not show the DAs and the court respect then they will not give any client a break... They will keep fighting you because they like the fight and they hate your lawyer. Thiessen gave them reasonable and sensible reasons why their case had weaknesses and because he has maintainted a rapport of respect and honesty with them, they listened. --- Anyone who will ever ask me "I have a DWI charge, who should I call?" so long as Thiessen is practicing will get the same answer. There's too much on the line to fool yourself into thinking any attorney will do the same job, or attorney X or Y could do just as well. I watch attorneys daily. I'

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Posted by anonymous | March 25, 2010 | DUI & DWI

Excellent DWI Lawyer

Mark Thiessen represented me in a DWI case a little over a year ago. He was recommended to me by a couple of my friends who also had used him in their own cases and had been very pleased with their outcomes. To be sure, though, I met with several other attorneys who specialize in DWI cases, but in ...the end was most impressed with Mr. Thiessen. As a disclaimer, I completely understand the seriousness and potential consequences of driving after having a few drinks. I admit that I made a mistake and have taken precautions since to avoid repeating a similar mistake. However, I also know the public (i.e. lobbying and interest groups) pressure on police officers and DA's to pursue these types of offenses and cases. I believe that my arrest was more a product of this pressure than due to my actions on the road. Mr. Thiessen approached my case with an open mind, and after performing the initial due diligence and viewing the evidence, agreed that we should fight the charges. I had heard horror stories about how often I would have to show up to court and go through the usual delays and positioning tactics used by both sets of attorneys. However, Mr. Thiessen, party due to his direct approach with the assistant DA's, was able to get my case dismissed at my second court appointment. He was excellent at explaining the process, the steps that I would be taking, and even my rights. He also kept me informed of our progress the entire time, and was always available to call when I had questions. DWI cases are complicated, and an unfavorable outcome can have serious implications on a person's life and/or career. I believe that it is imperative to use an experienced lawyer with an impeccable reputation who specializes in DWI cases. Therefore, I STRONGLY recommend Mark Thiessen to anyone who is in the unfortunate position of looking for a DWI attorney.

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Mark Ryan Thiessen's Lawyer Endorsements

Endorse Mark

Jeremy Axel

Criminal defense lawyer | Apr 08

Relationship: Worked together on matter

"I endorse this lawyer. Mr. Thiessen was a mentor to me when I was young lawyer and I couldn't be more grateful. This man was born to try cases. Not only is he a brilliant legal mind, but also relatable to juries and a fearless advocate. His results speak for themselves. He's won more than jury trials then average 20 lawyers combined. He's a great lawyer, great friend, and a great man I fully and sincerely him endorse him."

Clinton Morgan

DUI and DWI lawyer | Jan 06

Relationship: Fellow lawyer in community

"Mark Thiessen is the GOAT in DUI & DWI law. Only a fool would face a DWI charge without Mark by your side."

Ronald Yeates

DUI and DWI lawyer | Dec 10

Relationship: Worked for lawyer

"I was a career prosecutor until I retired. I knew Mark way back when and knew him to be special at what he does. He knew it all then and does so now, as well. He is not afraid to make the state prove its case. He is the only lawyer I know who is triple board-certified in DWI law and is a Lawyer-Scientist...Now, as a defense attorney and having the opportunity to watch him teach other lawyers all over the state, it is cemented in my mind... He is one of a kind."

Chris Denuna

DUI and DWI lawyer | May 21

Relationship: Co-worker

"Mark is known as one of the best of the best in not just DWI defense but criminal law as well in the legal community throughout the state of Texas. He's helped me elevate my skills as a trial lawyer, fight aggressively and relentlessly for our clients, and always has his door open for advise. I'm honored to have him as a mentor. He's a great lawyer and even better person."

Taly Thiessen

Criminal defense lawyer | May 07

Relationship: Worked together on matter

"Yes, he's my husband. But the best and hardest working attorney I know! Look at his stats, they speak for themselves."

Thomas Farnsworth

Criminal defense lawyer | Apr 16

Relationship: Worked together on matter

"Mark recently honored the Iowa Association for Justice (aka Iowa Trial Lawyers Association) as a guest speaker. The greats give back to the legal profession not expecting anything in return. He simply hopes to raise the bar for everyone. Mark did not disappoint. He flew into Iowa on a red eye and spoke the following day for over two hours. Mark could have spoken for the entire day as he captivated a room of accomplished trial lawyers. He is energetic and commands a mastery of OWI/DUI defense. As important to his control of a dynamic area of the law he extremely personable. I am happy to call him a friend. He would be at the top of my list to defend a serious criminal matter in the great state of Texas!"

Diana Sims

DUI and DWI lawyer | Jul 30

Relationship: Fellow lawyer in community

"If I ever have a DWI, I would hire Mark!"

Jarrod Smith

DUI and DWI lawyer | Apr 18

Relationship: Fellow lawyer in community

"Mark Thiessen is one of the top DWI lawyers in the country. He is a highly aggressive and effective trial lawyer. He fights harder than anyone I know. He routinely speaks and teaches other lawyers about DWI related issues. He consistently gets cases dismissed and not guilty verdicts at trial. If I was ever in trouble, I would want Mark Thiessen representing me. I enthusiastically endorse this lawyer."

Tristan Longino

Criminal defense lawyer | Mar 09

Relationship: Fellow lawyer in community

"Mark is a skilled attorney. He's personable and persuasive, two essential traits for defending a case to a jury. One of the "not guilty" verdicts he obtained that I heard about was shocking considering that it appeared to be an open and shut case for the prosecution. A truly gifted advocate."

Paul Morgan

DUI and DWI lawyer | Dec 04

Relationship: Fellow lawyer in community

"Mark is an exceptional lawyer and fights hard for his clients. Whenever I can, I try to either watch Mark defend his clients in court or learn from him in CLEs. This year alone, Mark beat down a case where a client was charged with 4 counts of felony intox. manslaughter and 1 count intox. assault. This is in addition to the mountain of acquittals he has under his belt. I would recommend Mark to anyone in need of a criminal defense attorney."

Andreea Ionescu

DUI and DWI lawyer | Nov 27

Relationship: Fellow lawyer in community

"The best DWI lawyer in Texas!"

Jeth Jones

DUI and DWI lawyer | Nov 02

Relationship: Worked together on matter

"Mark Thiessen is a "Lawyer's Lawyer". In other words, lawyers call him for advice. He is one of the most respected DWI Lawyers in the United States."

Albert Rowland

DUI and DWI lawyer | Oct 19

Relationship: Fellow lawyer in community

"Mark's results speak for themselves. What nobody sees on his Facebook page or website is what he does for fellow attorneys. I've personally only met Mark on one occasion, but I've talked to him on the phone and exchanged emails numerous times for advice and questions on cases. To me, a persons actions outside of the public view are the best barometer of their true character. My first time talking to Mark was before I even met him. He was working late on a Friday and I had some questions on an upcoming case. After finishing his work day, he took time out of his personal time to walk me through my questions. If someone is willing to do that for a complete stranger, without recognition, imagine the job he will do for your case."

Sean Darvishi

DUI and DWI lawyer | Mar 03

Relationship: Worked together on matter

"Mark is one of the best there is in the State of Texas for defending DWI cases."

Chris Hesse

DUI and DWI lawyer | Feb 15

Relationship: Fellow lawyer in community

"I knew Mark when I was in the Houston area from 2010 to 2015. Mark is easily among the top 5 DWI Attorneys in the State. He is routinely invited to lecture at Texas Criminal Defense Lawyer seminars. I observed Mark speak to a Jury Panel for Jury Selection during a misdemeanor DWI trial. The prosecutors were so intimated by Mark that they constantly objected--during Jury Selection! Objections are not very common during Jury Selection. The Judge was cautioning Mark in response to these objections (she was partial to the State). The objections were pretty silly and designed to disrupt Mark's speaking to the Jury. Mark confidently responded to the Judge's comments and resumed speaking to the Jury Panel. I learned something very valuable from Mark that day. When you are good like Mark, prosecutors fear you and this is obvious to the Jury. Mark's reputation as the best results in Not Guilty Verdics for his clients. He wins. Period."

Colin Hobbs

Criminal defense lawyer | Nov 19

Relationship: Opposing Counsel on matter

"As a former prosecutor, you always knew that when Mark walked through the door you were in for a fight if you went to trial. He knows his stuff, especially DWI law."

Joshua Hill

Criminal defense lawyer | Sep 09

Relationship: Fellow lawyer in community

"There are many great trial lawyers in Texas and there are many great DWI lawyers in Texas. What really sets Mark apart from the rest of the pack is his ability to be both. Mark has some of the most thorough understanding of all aspects of DWI cases, from the science involved to the applicable laws. Usually, more technical lawyers who understand the science or the law do not also excel in connecting with the common juror or in explaining difficult concepts to a jury or judge. Mark Thiessen is able to bridge this gap very successfully: his trial results clearly speak to this ability. I'm a board certified criminal trial attorney with over a decade of experience and multiple trials under my belt and I still learn and pick up a few tricks when watching Mark in trial or when he speaks at continuing legal education events. I endorse Mark Thiessen - he knows what he's doing."

Nathan Dineen

DUI and DWI lawyer | Jul 15

Relationship: Fellow lawyer in community

"I highly endorse Attorney Thiessen. He is a powerhouse in the field of DUI Defense. Well educated, highly skilled, aggressive trial lawyer. The type of lawyer that does not roll over! You need a fighter? Mark is your man!"

Michael LeMond

Unknown lawyer | Jun 09

Relationship: Fellow lawyer in community

"I endorse this lawyer."

Alan Macias

DUI and DWI lawyer | Mar 21

Relationship: Fellow lawyer in community

"I endorse this lawyer. Need a not guilty? Then this is the lawyer to call. I've known Mark for nearly four years and I've never seen him plead a case. When winning is what's important then this is who you need. Not only are you hiring a consummate professional you'll also be hiring a super nice person."

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Andrew Gendi

Criminal defense lawyer

Kacie Penman

Criminal defense lawyer

Clinton Morgan

Personal injury lawyer

Brian Roberts

Criminal defense lawyer

Ronald Yeates

Criminal defense lawyer

Chris Denuna

Criminal defense lawyer

Taly Thiessen

Family lawyer

Thomas Farnsworth

Criminal defense lawyer

Diana Sims

Criminal defense lawyer

James Rubin

Speeding and traffic ticket lawyer

Cheryl Brown

Criminal defense lawyer

Ralph Manginello

Personal injury lawyer

Jarrod Smith

Criminal defense lawyer

Tristan Longino

Family lawyer

Jeth Jones

Criminal defense lawyer

Jason Milam

Criminal defense lawyer

Chris Hesse

Criminal defense lawyer

Paul Schiffer

Criminal defense lawyer

Tom Hill

Criminal defense lawyer

Joshua Hill

Criminal defense lawyer

Experience

Rating: 10.0 (Superb)

Honors

2025

Super Lawyer, Super Lawyers

2025

Top 100 Super Lawyers in Texas, Thomson Reuters

2024

Super Lawyer, Super Lawyers

2024

Top 100 Super Lawyer in Texas, Thomson Reuters

2023

Super Lawyer, Super Lawyers

2023

Board Certified Advocate in Criminal Trial Law, NBTA Foundation

2023

Top 100 Super Lawyers in Texas, Thomson Reuters

2022

Super Lawyer, Super Lawyers

2022

Top 100 Super Lawyers in Texas, Thomson Reuters

2021

Super Lawyer, Super Lawyers

2021

BJJ Black Belt, IBJJF

2021

Top 100 Super Lawyer in Texas, Thomson Reuters

2020

Super Lawyer, Super Lawyers

2020

Top 100 Super Lawyer in Texas, Thomson Reuters

2020

Board Certified DUI Defense Specialist, National College for DUI Defense

2019

Super Lawyer, Super Lawyers

2019

Top 100 Super Lawyer in Texas, Thomson Reuters

2018

Top 100 Super Lawyers- Houston, Thomson Reuters

2018

Board Certified - DUI Defense, DUI Defense Lawyers Association

2018

Board Certified - Criminal Law, Texas Board of Legal Specialization

2018

Super Lawyer, Super Lawyers

2017

Texas Super Lawyer, Thomson Reuters

2017

Top 100 Super Lawyers- Houston, Thomson Reuters

2017

Super Lawyer, Super Lawyers

2016

Texas Super Lawyer, Thomson Reuters

2016

Super Lawyer, Super Lawyers

2015

Texas Super Lawyer, Thomson Reuters

2015

Super Lawyer, Super Lawyers

2014

Texas Super Lawyer, Thomson Reuters

2014

Super Lawyer, Super Lawyers

2013

Rising Star, Super Lawyers

2013

Super Lawyer, Super Lawyers

2013

Texas Super Lawyer, Thomson Reuters

2012

Unsung Hero Award, Harris County Criminal Lawyers Association

2012

Texas Rising Star, Texas Monthly Magazine

2012

Rising Star, Super Lawyers

2011

Texas Super Lawyer: Rising Star, Texas Monthly Magazine

2011

Rising Star, Super Lawyers

2010

Who's Who, Strathmore

2010

Rising Star, Texas Super Lawyers

See All Honors See Less Honors

Work Experience

2011 - Present

Attorney, The Thiessen Law Firm

2006 - 2011

Attorney, Trichter & Murphy, P.C.

See All Work Experiences See Less Work Experiences

Associations

2017 - Present

Texas Criminal Defense Lawyers Association

Board of Directors

2016 - Present

DUI Defense Lawyers Association

Board Member, Officer

2010 - Present

Harris County Criminal Lawyers Association

Board of Directors

2010 - Present

Team Hoger MMA and Muay Thai

Member

2008 - Present

Harris County Criminal Lawyers Association

Member

2008 - Present

Brazil- 021 BJJ Competition Team

Member

2007 - Present

Texas Criminal Defense Lawyers Association

Member

2006 - Present

National College of DUI Defense

Member

Texas Young Lawyers Association

Member

Houston Bar Association

Member

2023 - 2024

DUI Defense Lawyers Association

President

2020 - 2021

Harris County Criminal Lawyers Association

President

2013 - 2021

Texas Criminal Defense Lawyers Association

DWI Committee Chair

See All Associations See Less Associations

Sample of Legal Cases

Intoxication Manslaughter / State v. B.P.

Not Guilty

Assault Family Violence | State v. R.B

Dismissed Morning of Trial

Assault Family Violence | State v. W.R

Dismissed Mid-Trial

Intoxication Manslaughter | State v. G.G.

Not Guilty

Felony DUI 4th and felony DWAI 4th | People V CG

Not Guilty

DWI 4th / People v. B.D

Not Guilty

State v. L.E.

Dismissed

DWI / State v. A.S.

Dismissed

DWI 2nd / State v. C.M.

Not Guilty

DUI / People v G.E.

Dismissed

Intoxicated Manslaughter / State v. W.C.

Not Guilty

DWI / STATE OF TEXAS vs. J.E.

Dismissed

People of State of Colorado v. S.G.

Not Guilty

State v. A.J.

Not Guilty

Texas v. J.A.

Not Guilty

State v. P.I.

Not Guilty

State v. P.T.

Not Guilty

Texas V. T.W.

Not Guilty

SEE MY WEBSITE FOR CURRENT NOTABLE VICTORIES

NOT GUILTY

TEXAS V. H.B.

Not Guilty

Texas V. J.A.

Not Guilty

DWI 2nd / Texas V. L.J.

Not Guilty

Texas v. I.L

Not Guilty

Texas v. S.J.

Not Guilty

Texas v. H.D.

Not Guilty

Texas v. S.V.

Not Guilty

Texas v. Z.M.

Not Guilty

Texas v. H.S.

Not Guilty

Texas v. B.E.

Not Guilty

Texas v. M.A.

Not Guilty

Texas v. C.R.

Dismissed

Texas v. R.E.

Not Guilty

Texas v. B.S.

Dismissed

Texas v. H.D.

Not Guilty

Texas v. T.N.

Dismissed

Texas v. C.C.

Not Guilty

Texas v. K.R.

Dismissed

Texas v. C.T.

Dismissed

State v. E.O.

NOT GUILTY

Texas v. J.H.

Dismissed

Texas v. C.B.

Dismissed

State of Texas v. A.A.

NOT GUILTY

State of Texas v. M.H.

DISMISSED

State of Texas v. W.T.

NOT GUILTY

State of Texas v. C.R.

DISMISSED

State of Texas v. R.M.

NOT GUILTY

Texas v. G.A.

NOT GUILTY

State v. T.P.

DISMISSED

State v. L.V.

NOT GUILTY

State of Texas v. J. B.

NOT GUILTY

State v. A.D.

NOT GUILTY

State v. T.M.

DISMISSED

State v. T.B.

NO BILLED

State v. B.N.

NOT GUILTY

State of Texas v. C.L.

DISMISSED

State of Texas v. K.J

DISMISSED

State of Texas v. E.O.

Not Guilty

State of Texas v. M.R.

Not Guilty

State of Texas v. W.H

Not Guilty

State of Texas v. J.D.

Dismissed

State of Texas v. W. S.

Not Guilty

State of Texas v. F.K.

Not Guilty

State of Texas v. J.I.

Not Guilty

State of Texas v. K.W.

Not Guilty

State of Texas v. A.F.

Not Guilty

State of Texas v. C.C.

Not Guilty

State of Texas v. S.P.

Directed Verdict of Not Guilty

State of Texas v. S.M.

Not Guilty

State of Texas v. D.G.

Not Guilty

State of Texas v. K.P.

Mistrial

State of Texas v. Z.S.

Not Guilty

State of Texas v. B.H.

Not Guilty

State of Texas v. B.W.

Not Guilty

State of Texas v. S.C

Not Guilty

State of Texas v. I.R.

Not Guilty

State of Texas v. M.S.

Not Guilty

State of Texas v. R.P

Not Guilty

State of Texas v. J.F.

Not Guilty

State of Texas v. L.R.

Not Guilty

State of Texas v. D.D.

Not Guilty

State of Texas v. C.J.

Not Guilty

State of Texas v. S.C.

Not Guilty

State of Texas v. J.H.

Not Guilty

State of Texas. K.R.

Not Guilty

Texas v. G.R.

Dismissed

State of Texas v. O.S.

Dismissed

State of Texas v. T.M.

DISMISSED

State of Texas v. E.F.

DISMISSED

See More Legal Cases

Education

2003

South Texas College Of Law

JD - Juris Doctor

2000

Texas Christian University

Bachelor of Business Administration

1996

The Kinkaid School

High School Diploma

N/A

William S. Richardson School of Law, University of Hawaii

See All Education See Less Education

Speaking Engagements

2025

TCDLA 23rd Annual Top Gun DWI CLE

Top 10 Intoxicated Manslaughter Issues

2024

TCDLA Top Gun Advanced DWI CLE

Breaking Down Blood Testing for Lawyers

2023

TCDLA President’s Trip

Almost Everything You Need to Win DWI Trials

2023

Florida Bar Association Criminal Law Seminar

Intoxicated Manslaughter

2022

NHACDL Criminal Law Seminar

Images, Analogies, and Stories

2022

FACDL Blood Breath and Tears

Defending BWI Cases and Mock Trial

2021

TCDLA 8th Annual Lonestar DWI

Closing Arguments and Story Telling

2020

TCDLA 18th Annual Top Gun DWI Seminar

DWI Voir Dire

2020

OACDL Advanced Criminal Law

Defending Intoxicated Manslaughter Cases

2019

State Bar of Texas Advanced Criminal Law Course

Intoxicated Manslaughter Cases

2019

32nd Annual Rusty Duncan Advanced Criminal Law Seminar

Intoxilyzer 9000 and NEW Defenses

2018

ALL OVER USA SEE MY WEBSITE FOR CURRENT SPEAKING ENGAGEMENTS

2015

Prairie Dog Seminar

Not Guilty v Goliath; Beating High Blood Tests Using the Disconnect Defense

2014

TCDLA: Top Gun DWI Seminar

Blood Test Voir Dire & Preparing the Jury for Acquittal

2014

TCDLA: Cross Examination

Cross of DWI Blood Expert

2014

TCDLA Lone Star DWI

Blood 101: Basics of Blood Testing & Taking Down High Blood Tests Using the Disconnect Defense

2014

2014 Stuart Kinard Memorial Advanced DWI Seminar

Not Guilty vs. Goliath, Taking Down High Blood Tests with the Disconnect Defense

2012

HCCLA CLE

Trial Tactics From The Trenches

2011

Voir Dire Seminar

DWI Voir Dire - Accident and Blood Testing

2011

TOP GUN DWI

Final Argument - Blood Testing

2011

Art of War : Trial Tactics

DWI Trial Tactics: Running the Bases

2011

Art of War - Survivor Trial Tactics

DWI Survival Tactics

2010

Stuart Kinard Advanced DWI CLE

TIMBER! Chopping Down High Breath Tests

2010

Network of Professional Brazilians in Houston

Understanding Your Rights in Texas and Secrets to Avoiding a DWI Arrest and Conviction

2010

Galveston County Criminal Lawyers Association

Timber!; Chopping Down High Breath Tests

2010

DWI, Drugs, Assault, Criminal Mischief and the Prom

Keeping Students Safe from DWI and Drugs

2009

Montgomery County Criminal Defense Lawyers Assoc.

Death to the "E" Jury; Getting a Fair Trial

2009

DWI Defense Project

DWI Trial Tactics

N/A

No refusal debate draws strong opinions DUI

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Publications

2024

The Voice (TCDLA)) TCDLA Voice for the Defense

2018

Various Magazines SEE MY WEBSITE FOR CURRENT PUBLICATIONS

2014

The Voice (TCDLA)) Not Guilty v Goliath; Beathing High Blood Tests Using the Disconnect Defense

2012

HCCLA Defender Magazine Falesly Elevated Ethanol Results Using Hospital Enzymatic Assay Blood Testing

2012

The Voice (TCDLA)) Falsely Elevated Ethanol Results Using Hospital Enzymatic Assay Hospital Blood Testing

2011

HCCLA Defender Building the Disconnect Defense

2010

TCDLA VOICE for the Defense Catch of the Day: Motion Challenging Jury Array and to Quash Jury Panel

2010

HCCLA Defender Magazine Motion of the Month: Challenging Electronic Juries

2009

Voice for the Defense Catch of the Day: Defendant's Motion to Protect the Fairness of Future Juries

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English

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Q&A

Can I have a prescription for a benzodiazepine and still get a drivers license in Texas?

20 Aug 2019

Q&A

Will I go to jail if I was arrested with a pi while on probation for a dwi?

26 Dec 2011

Q&A

Should I plead not guilty for an open container violation while on Conditional Discharge?

13 Oct 2011

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Legal Guides

Legal Guide

"E" Juries (Montgomery County); Challenge the Array and Quash the Panel

04 May 2010

Legal Guide

WEAVING Case Law Summary

22 Mar 2010

Mark Ryan Thiessen

About Mark

Biography

The ONLY ONE IN THE WORLD Quadruple Board Certified in Criminal Law, DUI Defense, DUI Law, and Criminal Trial Advocacy. Honestly, if I can't win your case, I don't know who can. The ONLY DWI attorney to Make Top 100 Super Lawyers in Houston and/or TX. I've personally won 140+ Not Guilty Verdicts!

The ONLY ONE IN THE WORLD Quadruple Board Certified in Criminal Law, DUI Defense, DUI Law and Criminal Trial Advocacy. Honestly, if I can't win your case, I don't know who can. Trial tested and proved! Specializing in Criminal Defense and DWI Defense.

The ONLY ONE IN THE WORLD Quadruple Board Certified in Criminal Law, DUI Defense, DUI Law and Criminal Trial Advocacy. Honestly, if I can't win your case, I don't know who can. Set it for trial! Specialize in Criminal and DWI Defense. I fight!

WE FIGHT GIANTS! We aren't scared of big insurance. If they won't pay policy limits, then we take them to trial and crack them open for maximum payment. Wait until you see us in trial!

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Licensed in Colorado for 9 years

Licensed in Texas for 22 years

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