
Thiessen Law Firm
733 E 12th ½ St, Houston, TX 77008
Specialization in:
About
Board-certified in Criminal Law by the Texas Board of Legal Specialization, DUI Defense by NCDD, and DUI Law by DUIDLA, Mark Thiessen is one of Houston’s elite triple-certified DWI attorneys. Known as a "lawyer-scientist" with ACS-CHAL credentials, he combines scientific expertise with courtroom experience to challenge chemical testing procedures. Thiessen has secured verdicts from misdemeanors to intoxication manslaughter and is the only DWI attorney consistently ranked in the Top 100 Super Lawyers in Texas and Houston since 2017. Clients benefit from 24/7 access, aggressive trial readiness, and proactive license-saving strategies, all delivered with personalized attention from a leading Houston DUI specialist.





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