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Thiessen Law Firm | Houston DWI Attorney

Editorial Verdict

Why Choose Thiessen Law Firm?

DWI defense is its own world — breath tests, blood draws, field sobriety — and it rewards specialists. Mark Thiessen has built his entire firm around that specialization. Triple board-certified, ACS-CHAL Forensic Lawyer-Scientist, named to the Top 100 Houston Super Lawyers since 2017 and Top 100 Texas Super Lawyers from 2019–2024 (the only DWI attorney on that list). His record of 100+ Not Guilty verdicts at trial is unusual; most defense lawyers will steer you to a plea. If you're facing a DWI — first-time, repeat, or felony — and you want someone who knows the science and isn't afraid to take it to a jury, Thiessen Law Firm is the call.

Practice Areas

Situations They Handle

First-Time DWI Repeat / Felony DWI Intoxication Manslaughter Boating While Intoxicated ALR Hearings (license suspension) Drug Charges Federal Criminal Defense Expunctions / Non-Disclosure

Fees & Pricing

What You'll Likely Pay

Thiessen Law Firm quotes a written flat fee up front for every case. There are no hourly surprises. Fees reflect the firm's specialization, trial track record, and the work required to fight the case scientifically.

$5,000–$15,000

first-time misdemeanor DWI (flat)

$25,000+

felony DWI / intoxication manslaughter

The Team

Key Attorneys

Mark Thiessen

Founder & Lead Trial Attorney

Triple board-certified DWI; 100+ Not Guilty verdicts; ACS-CHAL Forensic Lawyer-Scientist

DWI Trial Team

Senior Associates

Blood case defense, breath test challenges, ALR hearings, jury trials

Forensic Specialists

Science Team

Gas chromatography, retrograde extrapolation, NHTSA SFST challenges

Client Experiences

What Clients Say

Tyler S.

First-Time DWI · Houston Heights

★★★★★

"Got pulled over after one drink at dinner. The State's case looked airtight. Mark Thiessen tore the breath test apart on cross. Not Guilty verdict in under an hour. He's the real deal."

Vanessa O.

Felony DWI · Harris County

★★★★★

"Third DWI, facing real prison time. Mark fought the blood draw warrant and got key evidence suppressed. Charges reduced to a misdemeanor with probation. He saved my life."

Brian P.

BWI · Galveston Bay

★★★★★

"Boating While Intoxicated charge after a 4th of July weekend. Mark's team knew the boat-stop rules better than the prosecutor. Case dismissed at pretrial. Worth every dollar."

Get Help Now

Request a Free Consultation

Tell the Thiessen team about your DWI charge. The firm reviews every consultation personally — same-day appointments are standard for active cases.

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FAQ

Common Questions About This Firm

What does "triple board certified" actually mean?

It means Mark Thiessen has earned formal certification from three separate bodies: the Texas Board of Legal Specialization (Criminal Law), the National College for DUI Defense (American Bar Association approved), and the DUI Defense Lawyers Association. Less than 1% of criminal lawyers hold even one of these. As of July 2022, Mark is the only attorney in America to hold all three.

Do they take cases other than DWI?

Yes. The firm handles federal criminal defense, drug charges, intoxication manslaughter, and other serious criminal matters. But DWI is the firm's deep specialty and they accept the most demanding cases in that area.

What is an ALR hearing and do I need help with one?

ALR (Administrative License Revocation) is the civil hearing that decides whether your driver's license is suspended after a DWI arrest. You have only 15 days from arrest to request a hearing. If you miss it, your license is suspended automatically. The firm handles ALR hearings in every DWI engagement.

How much does a Thiessen DWI defense cost?

Fees depend on case complexity — misdemeanor first-time DWI typically runs $5,000–$15,000 flat; felony DWI, blood cases, and intoxication manslaughter start in the mid five figures. You receive a written quote before retention with no hourly billing.

Can my DWI charge actually be dismissed?

Sometimes — yes. The firm has gotten thousands of charges dismissed and won 100+ Not Guilty verdicts. Suppression of bad blood draws, faulty breath calibrations, illegal stops, and constitutional violations all happen in DWI cases. Whether your case has those issues requires a real review.

Helpful Resources & Related Pages

Legal Need Guides

Criminal Defense Guide DUI / DWI in Texas If You Were Injured by a Drunk Driver

What To Do If You're Arrested in Houston How Much Does a Criminal Defense Lawyer Cost? All Houston Law Firms

Quick Facts

Founded2008

Firm SizeBoutique · DWI Specialty

Fee StructureFlat fee

Free ConsultationYes

LanguagesEnglish, Spanish

Virtual AvailableYes

Service AreaHouston, Harris County, statewide TX

Client Reviews4.9 (320+)

Request Free Consultation

Office

Main Office: 733 East 12th Street, Houston, TX 77008
(713) 864-9000

Recognition

✓ Triple Board Certified (Criminal Law, DUI Defense, DUI Law)
✓ Top 100 Texas Super Lawyers 2019–2024
✓ Top 100 Houston Super Lawyers 2017–2024
✓ ACS-CHAL Forensic Lawyer-Scientist
✓ 100+ Not Guilty Verdicts at Trial

Thiessen Law Firm

Why Choose Thiessen Law Firm?

Situations They Handle

What You'll Likely Pay

Key Attorneys

Mark Thiessen

DWI Trial Team

Forensic Specialists

What Clients Say

Request a Free Consultation

Similar Firms in Houston

Common Questions About This Firm

Helpful Resources & Related Pages

Quick Facts

Office

Recognition

Smart-hire checklist before you call.