The Thiessen Law Firm is a criminal defense firm based in Houston, Texas. We are distinguished by our intricate knowledge of the law and related sciences, our professionalism in and out of court, and our 24/7 commitment to our clients. Led by aggressive trial lawyer Mark Thiessen, the Thiessen Law Firm represents individuals facing charges that range from petty theft to murder, with a strong focus on DWI and drugs-related charges. We emphasize quality over quantity, taking as much time as needed to bring about favorable results for our clients. As a DWI trial lawyer, Mark Thiessen is prepared for trial on any given date. He is well-versed in the rules of evidence, DWI case law and constitutional law, as well as related scientific and technical areas including anatomy, physiology, toxicology, chemistry, computer science, biology and physics. He has received many awards and honors, including: • Thomson Reuters Texas Super Lawyer, 2013 -2019 • AVVO Rated 10/10: Superb, 2010-2019 • Board Certified: Criminal Law - Texas Board of Legal Specialization • Board Certified: DUI Defense - DUI Defense Lawyers Association, 2018 • Youngest elected board member for the Harris County Criminal Lawyers Association (HCCLA) • Texas Rising Star - Texas Monthly Magazine, 2012 • HCCLA Unsung Hero Award, 2012 • Lawline.com, Furthered 40 Attorneys in the Nation, 2012 • Strathmore’s Who’s Who Lifetime Member