Mark Ryan Thiessen
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Mark Ryan Thiessen
Biography
Mark Thiessen is a criminal trial lawyer and the Chairman/CEO of the Thiessen Law Firm in Houston, Texas. Mark is Board Certified in Criminal Law by the Texas Board of Legal Specialization and Board Certified in DUI Law by the DUI Defense Lawyers Association. Mark earned the American Chemical Society-Chemistry and the Law (ACS-CHAL) Forensic Lawyer-Scientist designation, which is the highest form of scientific recognition available for lawyers. Mark is a frequent legal seminar lecturer, author of numerous published legal articles, and a faculty member for various organizations. Mark is the current DWI Committee co-chair and on the Board of Directors for Texas Criminal Defense Lawyers Association (TCDLA), on the Board of Directors for Harris County Criminal Lawyers Association (HCCLA) and a Charter Member and Director for DUI Defense Lawyers Association (DUIDLA). Mark is a 6 time Texas Super Lawyer and in the Top 100 Super Lawyers in Houston (2017 & 18). In 2019, Mark was the only criminal lawyer to be named to the Top 100 Super Lawyers in all of Texas. Mark has won DWI cases from total refusals up to quadruple intoxication manslaughter.
Mark’s reputation for fearlessness extends beyond his presence in the courtroom. In his free time, he competes as a Brown Belt in Brazilian jiu-jitsu, Muay Thai, and participates in competitions such as the Warrior Dash and Tough Mudder. He is also an avid snow skier, wake boarder and tennis player.
Practice Areas
Criminal Law
Criminal Appeals, Drug Crimes, Expungement, Fraud, Gun Crimes, Internet Crimes, Sex Crimes, Theft, Violent Crimes
DUI & DWI
Cannabis & Marijuana Law
Marijuana Business Formation, Medical Marijuana
Personal Injury
Animal & Dog Bites, Brain Injury, Car Accidents, Construction Accidents, Motorcycle Accidents, Premises Liability, Truck Accidents, Wrongful Death
Fees
- Free Consultation
Jurisdictions Admitted to Practice
Languages
Professional Experience
Attorney Bell Ryniker Letourneau & Nork
Year: 2003 - 2004
Description:
Attorney Brown Sims, P.C.
Year: 2004 - 2006
Description:
Attorney/CEO Thiessen Law Firm
Year: 2011 - Current
Description:
Trial Attorney Trichter and Murphy
Year: 2006 - 2011
Description:
Professional Associations
DUIDLA Vice President (2014 - Current)
HCCLA President Elect and Board of Directors (2006 - Current)
TCDLA DWI Co-Chair and Board of Directors (2005 - Current)
NCDD Member (2005 - Current)
State Bar of Texas  # 24042025 Member (2003 - Current)
Publications
Over 20 Published Works - See My Website, Please
2019’s Need-to-Know Changes to DWI Law TCDLA Voice for the Defense (November 8, 2019)
Awards
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Top 100 in Texas
Super Lawyers 2017.0
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Black Belt
IBJJF 2021.0
Note: Black Belt in Brazilian Jiu Jitsu
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Top 100 in Texas
Super Lawyers 2020.0
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Top 100 in Houston
Super Lawyers 2020.0
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Super Lawyer
Super Lawyers 2019.0
Note: Selected To Super Lawyers: 2013 - 2019
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AV Preeminent
Martindale-Hubbel Lawyers Service 2019.0
Note: Peer Rated for Highest Level of Professional Excellence
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Top 100 in Houston
Super Lawyers 2019.0
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Top 100 in Houston
Super Lawyers 2018.0
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Top 100 in Houston
Super Lawyers 2017.0
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Lawyer Scientist
ACS-CHAL 2014.0
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Rising Star
Super Lawyers 2013.0
Note: Selected To Rising Stars: 2010 - 2013
Education
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Trinity University
Year: 1998
Honors: Activities: Omega Phi and Tennis
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South Texas College of Law J.D. | Law
Year: 2003
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University of Hawai'i at Manoa William S. Richardson School of Law Environmental and Admiralty Law
Year: 2002
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Texas Christian University B.B.A. | Marketing
Year: 2000
Honors: Activities: Phi Delta Theta
Speaking Engagements
Over 70 Speaking Engagements - International
Over 70 Speaking Engagements - International
Certifications
- Board Certified in DUI Law: National College for DUI Defense 2020
The Thiessen Law Firm
733 E 12th 1/2 St, Houston, TX 77008