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Mark Rush Williamson

Attorney Profile

Top Rated Family Law Attorney in Dallas, TX

Sullivan, Klocke & Williamson, PC
12222 Merit Dr, Suite 1200
Dallas, TX 75251
Phone: 214-730-0432
Selected to Super Lawyers: 2004 - 2005, 2012 - 2015, 2019 - 2022
Licensed in Texas Since: 1985
Practice Areas: Family Law
Attorney Profile

Mark Rush Williamson is a partner at the law firm Sullivan, Klocke & Williamson, P.C., which has its offices in Dallas, Texas. Focusing his practice on representing those who are facing family law-related issues, he takes on cases involving divorce, modifications, custody and support, grandparents’ rights, paternity, and contested business and professional property division cases, to name a few.

With over 25 years of experience practicing law, Mr. Williamson is well known for the kindness and empathy he shows while handling any case. He understands the sensitive nature of family law matters and the impact they can have on his clients, and he walks them through the legal process compassionately and fights aggressively for their best interests and their rights.

Graduating from the Baylor University - Hankamer School of Business, Mr. Williamson completed his bachelor’s degree with a major in accounting and finance. He went on to study law at The University of Texas School of Law and obtained his Juris Doctor in 1985. He is licensed to practice in Texas and before the U.S. District Court for the Northern District of Texas and the U.S. Tax Court.

Mr. Williamson is actively involved within the legal community and has memberships in the Dallas Bar Association’s Family Law Section, the Texas Bar Association’s Family Law Section and the Collin County Bar Association. He also serves as a barrister at the American Inns of Court.

Recognized for his impeccable work in the family law field, Mr. Williamson has received the highest rating through Martindale-Hubbell, the AV* Preeminent peer-review rating. He also has a 10 out of 10 rating on Avvo with numerous five-star ratings from his happy clients. Additionally, Texas Monthly Magazine named him to its Top Rated Lawyers list and its Top Lawyers of Texas list.

*AV®, AV Preeminent®, Martindale-Hubbell Distinguished and Martindale-Hubbell Notable are certification marks used under license in accordance with the Martindale-Hubbell certification procedures, standards and policies. Martindale-Hubbell® is the facilitator of a peer-review rating process. Ratings reflect the anonymous opinions of members of the bar and the judiciary. Martindale-Hubbell® Peer Review Ratings™ fall into two categories – legal ability and general ethical standards.

Practice Areas
  • 100%Family Law
Focus Areas

Adoption, Custody & Visitation, Divorce, Domestic Violence, Paternity, Prenuptial Agreements, Marital Property


10 Years Super Lawyers
  • Super Lawyers: 2004 - 2005, 2012 - 2015, 2019 - 2022

About Mark Rush Williamson

First Admitted: 1985, Texas

Professional Webpage:


  • , Super Lawyer, Texas Monthly Magazine 2019, 2020, 2021, 2022
  • , Top-Rated Lawyer, AVVO, 2012 – 2022
  • , AV Preeminent rating, LexisNexis Martindale-Hubbell 2005 – 2022

Educational Background

  • Baylor University, BBA, Major: Accounting, 1982

Bar/Professional Activity

  • Dallas Bar Association, Family Law Section, Member: Texas Bar Association, Family Law Section, Member: Collin County Bar Association, Member: American Inns of Court, Barrister, 2021
  • U.S. Tax Court, 1987
  • U.S. District Court Northern District of Texas, 1990
  • Texas, 1985
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Office Location for Mark Rush Williamson

12222 Merit Dr
Suite 1200
Dallas, TX 75251

Phone: 214-730-0432

Last Updated: 9/30/2022

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