Williamson Law Firm Attorneys

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Trust In Our Attorneys

We provide principled, honest family law services to clients across North Texas.


Family law concerns are not simple for anyone. Any family law matter represents a fundamental shift in your life, whether that is a joyful moment like expanding your family through adoption or a difficult change such as divorce, you do not have to be alone.

Our attorneys work to provide hope for your family. When you come to Williamson Law Firm, PLLC, we will prioritize you and your family.

Our Practice Areas


No one wants to wonder about where they are or what they are facing under any circumstance. This is especially true when it comes to the law. At Williamson Law Firm, PLLC, our attorneys will give you an honest assessment of your family law concerns, what the future looks like and the best way to make your goals a reality.


Your family is important to you, and we dedicate ourselves to protecting it. If there is a child custody or a child injury concern, we want to make sure we can help as soon as possible.

Every case we work on gets individual attention aligned to your priorities. We will work to get the results you need in your family law matter in the way you most need it, whether that means:

  • Negotiating with opposing sides
  • Collaborating through alternative dispute resolution
  • Forcefully advocating for you in front of a judge
  • Meticulously building an adoption application

We want you to see our complete and total commitment to you.

Meet Our Attorneys

Mark Rush Williamson

Mark Rush Williamson

Attorney Mark Rush Williamson has spent a career working with Texans on what matters most to them in family law.

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Mary Beth Sullivan

Mary Beth Sullivan

Attorney Mary Beth Sullivan is a talented attorney who strives to put her clients needs first.

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Eric B. Klocke

Eric B. Klocke

Attorney Eric Klocke’s attention to detail and personable work-ethic has made an impact for all his clients.

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What Our Clients Say About Us

“Mark and his team were the kindest most caring legal team I have ever met. They were fast and on top of everything. They kept us informed every step of the way. They made our family dream complete. Excellent smooth experience with our adoption.”

– La Vone Jane Crowe

What Our Clients Say About Us

“Mark handled my bitter divorce in the best possible way, avoiding what would have been a costly and acrimonious trial. His help and advice, particularly during mediation, was much appreciated.”

– Ted, Addison, TX

What Our Clients Say About Us

“Mark has been a great advisor for the last 7 years. I couldn’t be happier with the results achieved by following Marks advice. I trust Mark and count him as a friend.”

– Christian Jennings

Our office is in Dallas county, but we serve clients across North Texas. Call us today at 469-385-3305 or email us. We want to hear from you. We want to help you get what you need.