About Mark Thiessen

Mark Thiessen prides himself on being an aggressive trial lawyer. If the district attorney will not bargain or justice will not be served by allowing the client to plead guilty, Mark passionately and professionally represents his clients at trial. He has won DWI cases from total refusals up to quadruple intoxication manslaughter. Mark has earned formidable reputation for being a tenacious Houston DWI trial lawyer, and he works hard to maintain that status. Mark is licensed and tries cases in Texas and Colorado.

Since opening Thiessen Law Firm, Mark has continued to add to his growing list of accomplishments. In addition to his widely publicized feats as a winning Houston intoxication manslaughter lawyer, Mark Thiessen was the youngest criminal Super Lawyer in Texas in 2013. As of 2022, Mark is a 10 time Texas Super Lawyer, 6 time Top 100 Super Lawyers in Houston and 3 time Top 100 Super Lawyers in all of Texas. For the past two years, Mark has been the only DWI lawyer listed in the Top 100 in Houston and the only criminal Super Lawyer listed in the Top 100 Lawyers in Texas.