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Reputation. Respect. Results

You need an experienced lawyer who focuses exclusively on defending criminal cases and who will aggressively protect your rights.

Mark A. Diaz has successfully defended clients facing all types of charges for over 20 years.

Available 24/7, Houston/Galveston
Free Consultation

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Mark Diaz

Aggressive Galveston Criminal Defense Attorney

Criminal Defense Attorney in Galveston, Mark Diaz has been aggressively defending the rights of Texans for over eighteen years. Mark is a seasoned litigator who has tried every kind of criminal defense case. Mark’s clients receive his cell phone number, so they can connect any time they need help. From arrest through trial, Mark works hard to get the best possible results in and out of court.

Meet Mark Diaz

Federal Criminal Defense

I have defended countless clients accused of federal crimes. As an experienced federal litigator, I know how to assemble an effective defense for high profile crimes.

White Collar Crimes

Because these types of cases are often subject to both state and federal prosecution, it is important to work with a criminal defense lawyer who is comfortable defending a case at any level.

Drug Possession

Because drug possession is a serious crime that can result in life-changing penalties, it is absolutely imperative to work with a Texas criminal defense lawyer who understands the law in this area.

DWI Charges

A DWI Charge Can Put Your Life on Hold. A single arrest can seriously jeopardize your job, your freedom, and your reputation. If you have been arrested for drunk driving, you can’t afford to delay your defense.

Why Hire Us?

When you have been charged with a crime in Galveston County and the Greater Houston area, you need an experienced criminal defense lawyer who focuses exclusively on defending criminal cases and who will aggressively protect your rights.

Throughout my career, I have successfully handled every type of criminal defense case. More importantly, criminal defense is the only thing I do. I have witnessed firsthand how a criminal charge can negatively impact every area of a person’s life. As a criminal defense lawyer, I consider it a privilege to help people during this stressful time in their lives. Call me today at (409) 515-6170 for a free consultation to discuss.

About Us Testimonials

It is hard getting a good attorney that works for you and won’t give you the run around like other out there..overall very professional aggressive on working and winning my case!!- Mario S.

Free Case Evaluation

Call us 24/7 at (409) 515-6170 or fill out the form below to receive a free and confidential initial consultation.



    We Respect your Privacy, Any information submitted will be confidential

    Getting the Charges Against You Dropped or Dismissed
    Getting the Charges Against You Dropped or Dismissed

    Just because you have been charged with a crime does not mean you are guaranteed to end up with a criminal record. Never assume your case is hopeless or a lost cause.

    Three Steps to Take If You’ve Been Charged With Domestic Violence
    Three Steps to Take If You’ve Been Charged With Domestic Violence

    While you may be in a bad situation, you don’t want to do anything to make it worse and should take immediate action to protect yourself.

    Only the finest

    Meet our Attorneys

    When you have been charged with a crime, you need experienced criminal defense lawyers who focus exclusively on defending criminal cases and who will aggressively protect your rights. Throughout our careers, we have successfully handled every type of criminal defense case. More importantly, criminal defense is the only thing we do.

    Galveston Criminal Defense Lawyers

    Jessica Ebbs

    Felony Case Defense Lawyer

    Jessica understands that a criminal conviction can impact someone for the rest of their life and that there is no substitute for one’s liberty. Merely being accused of a crime can severely impact someone’s life and Jessica takes such matters very seriously.

    Jessica Ebbs was raised and has lived in Galveston County her entire life. In 2012, Jessica graduated cum laude from Sam Houston State University with a Bachelor of Business Administration in Accounting. After college, she attended South Texas College of Law to obtain her law degree. After completing law school, Jessica started at the Galveston County District Attorney’s Office as an Assistant District Attorney.

    Mark Diaz

    Experienced and Aggressive Texas Criminal Defense Attorney

    Mark understands that being charged with a crime is an emotional and personal challenge. He considers criminal defense his life’s work, and he is committed to providing each client with personalized attention, affordable representation, and the best defense available anywhere.

    In the realm of criminal defense, questions and concerns can’t always wait until morning. Mark’s clients receive his cell phone number, so they can connect any time they need help. From arrest through trial, Mark works hard to get the best possible results in and out of court.

    Mark Diaz has been aggressively defending the rights of Texans for over eighteen years. A 1998 graduate of Thurgood Marshall School of Law who obtained his undergraduate degree from the University of Houston, Mark concentrates his practice solely in the area of criminal defense.

    Thomas Overhouse

    Criminal Defense Lawyer

    Thomas understands the toll that being wrapped up in the criminal justice system can take on someone. From the point of being accused of a crime to the final disposition of a criminal charge can be overwhelmingly stressful and Thomas works tirelessly to take some of that burden off of his clients.

    In 2012, Thomas graduated suma cum laude from the University of St. Thomas with a Bachelor of Arts in History. Upon completion of his undergraduate degree, Thomas attended South Texas College of Law and earned his law degree.

    Matthew Sloan

    1992 - 2020

    Matthew understands that a criminal conviction can impact someone for the rest of their life and that there is no substitute for one’s liberty. Merely being accused of a crime can severely impact someone’s life and Matthew takes such matters very seriously.

    It is with great sadness that we inform you of the tragic and unexpected passing of our Associate Attorney, Matt Sloan. Matt passed away in an automobile accident last Wednesday, May 13th. He was an exceptional attorney and an invaluable member of our firm for the past year.

    Dulce S. Salazar Valle

    Texas Criminal Defense Lawyer

    Dulce S. Salazar Valle is a dedicated criminal defense lawyer who passionately represents her clients. As an experienced attorney and former prosecutor, Dulce understands the high stakes and negative impact individuals face when confronted with criminal charges. She approaches every case with compassion and zeal, ensuring that her clients' rights are protected and they receive the best possible defense.

    Before joining Mark Diaz & Associates, Dulce served as an Assistant District Attorney in Fort Bend County, Galveston County, and Nueces County. This experience provided her with unique insights into the most effective ways to defend clients' rights and combat criminal charges.

    Benjamin Shabot

    Experienced Texas Personal Injury Lawyer

    Benjamin, a native of Galveston, is a distinguished personal injury attorney. With a career spanning nearly two decades, he has established himself as a seasoned litigator known for his dedication and tenacity in the courtroom. His extensive experience has equipped him with the skills necessary to tackle complex legal challenges, making him a trusted ally for those seeking just compensation after serious injuries.

    His commitment to his clients goes beyond mere representation; he is passionate about helping them navigate the intricacies of the legal system and is relentless in his pursuit of justice.
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      We Respect your Privacy, Any information submitted will be confidential

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