Dallas DWI Lawyer – Attorney Profile

Dallas DWI Attorney Mark Lassiter, J.D. is a knowledgeable young criminal defense attorney who concentrates his practice in DWI defense.

Mark graduated from South Texas College of Law where he excelled in the top Trial Advocacy law school in the country. He was selected to serve as a Trial Advocate in just his first year of law school.

Mark continued to hone his trial skills by joining the Dallas County District Attorney’s office as an Assistant District Attorney on his graduation from law school. There, as a prosecutor Mark Lassiter handled countless cases including DWI, Assault, and Drug Offenses. During his tenure at the District Attorney’s Office Mark developed a reputation as an excellent trial attorney gaining respect from his peers at the DA’s office and defense attorneys alike.

Before Mark went to law school he attended Texas A&M University graduating with high honors and a degree in Business Management.

Mark T. Lassiter also has served the Army faithfully for 10 years. He began his career in the Army at 18 years old as an Airborne Infantryman. There he served as part of the 143rd Long Range Surveillance Team (LRS). This team was designed to parachute in behind enemy lines and radio crucial intelligence back to the front lines, all without being detected. This required countless hours of training and attention to detail because any small mistake could lead to destruction of the entire team. It was here that Mark learned what it means to work under timetables in a stress filled environment. He learned what it takes to get things done and he will put that knowledge to work for you.

Lassiter continued his career in the Army by becoming an M1AbramsA2 tank gunner. During the course of his training on this battle tank Mark received an award for the honor graduate of his class.

While serving as a tank gunner Lassiter was selected to attend Officer Candidate School. This school transformed enlisted soldiers into officers. Lassiter again received honors for his excellent performance throughout his attendance at Officer Candidate School. From there Mark was selected to serve as a member of the JAG Corp due to his legal expertise. After 10 years of faithful service Mark retired from active service.


  • J.D., South Texas College of Law
  • B.A., Texas A&M University – Business Management


  • Texas Criminal Defense Lawyers Association
  • American Association for Justice
  • Texas Young Lawyers Association
  • Dallas Bar Association
  • Dallas Young Lawyers Association

Founding Member

  • Barrett Bright Lassiter Linder

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You know when you seek medical care; you put your life in the hands of doctors. You want someone to fight for you as they would fight for themselves. The same occurs with an attorney and Mark is definitely someone that will fight for you.

Dr. Patrick W.

I was arrested in March 2010 for suspicion of DWI, and had blown a 0.18. I retained Mark 3 days later and through his hard work and diligence my case was dismissed without my ever having to appear in front of a judge. His knowledge of criminal law is incredible, and he is very kind, and was incredibly respectful and encouraging throughout this entire harrowing process. Previous to this arrest I had never had so much as a speeding ticket and I came into this extremely scared and terrified of the long term implications of a DWI conviction in Texas, as Texas is not a state that allows adjudication and I am an RN who made one incredibly bad decision, but a conviction on DWI could cost me my license to practice. I chose Mark on the recommendation of several people whom I trust, and I am so glad I did! His staff is very courteous and helpful, and his track record is impeccable! I honestly didn’t dare hope that I might be so fortunate as to get my case dismissed, but Mark came through for me with flying colors! Thanks to Marks knowledge and hard work I will be eligible to have this arrest expunged from my record in two years, and can relax knowing that my license to practice is safe. Mark was also always willing to hear me out and never tried to pressure me into anything I was uncomfortable doing, he returned my calls and emails within hours and did everything he could to reassure me that while there was a great deal of gravity to the situation I had landed myself in, that he would champion my cause. I made a terrible, terrible choice, and I am so grateful and fortunate the no one was hurt. I owe so much to Mark, and I will never be able to thank him enough for his hard work on my behalf.


Obviously you have accessed Mark Lassiter’s website, please bear with me while I inform you about your good fortune. Unfortunately I found myself retained by the Garland Police some time ago on a DWI charge. I have never heard any of my friends/co-harts discuss this subject. Due to the personal humiliation of the circumstances, this is not something that I would approach them on either. So I had to rely on Google to find attorneys that dealt with this type of thing for Garland. Finding multiple hits I began the review of websites until I accessed M. Lassiter’s. I was extremely impressed. I made contact with him with the normal trepidation of retaining an unknown individual for such a sensitive personal matter. Little did I know at the time of my good luck. During the course of my case, a couple of attributes I learned about M. Lassiter are as follows: · He was very capable, and never lost focus of my case and best interests · He was easy to talk to and actually listened and responded to the pros and cons of my standpoints · He is a very personable and energetic person Ultimately I am sure you will find retention of M. Lassiter a most beneficial partnership in the resolution of your case.

Best Regards, Rita L.

In need of legal representation, we researched qualified attorneys in the Dallas Area. At our initial consultation with Mark Lassiter, he discussed his fees, plan of action, and potential outcomes of the case.  We found him to be not just competent, but detail-oriented and thorough.  His knowledge of the law and court proceedings was comforting. Mark Lassiter kept us informed of progress, and was able to resolve the case as quickly as possible.  Through his diligence, we got the best possible outcome. We would highly recommend his services to anyone who asks.

Bob and Jill

I found information regarding Mark by searching the web while in Illinois and my son was needing representation in Tarrant County Texas. Mark returned every single call I made, and every email I sent. I believe that Mark is a fair and honest and will try to do what is best for who he represents.


I had never been in trouble with the law. I had no idea who to call or what to do and I was certain this was going to hang over me the rest of my life. Mark took care of everything. From the first conversation he put my mind at ease and assured me everything was going to be OK…and he was right. He literally made it GO AWAY! Thank goodness. Now, that one moment of my life will not ever define who or what I am.


I’ve finally found a lawyer I can count on.

Cody B.

I switched from my original lawyer to you because you made sure I understood the entire process.

Amanda H.

My family and I will always be indebted to you.

Lisa L.

You were able to help me win my case when I didn’t think anybody could.

Roger C.

I would never use or recommend anyone else for anybody else for a criminal manner.

Cory M.

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