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Mark Rush Williamson

Mark Rush Williamson

also known as Mark Williamson

Practice areas:

Divorce & Separation, Family, Child Custody, Adoption, Child Support

About Me

I made the decision long ago to not be part of a large multi-layered law firm, to focus my practice entirely on family related cases, and work with only a few, select clients at any given time. As a result, I am able to take time to provide individualized attention to each client. In addition, by limiting our practice to family law we have been able to hone our legal skills in a single area of the law which ultimately benefits our clients.


Family law cases often "blow up" but they don't have to most of the time. My goal is to help you resolve your unique case quickly in a civilized manner; however, if that's simply not possible I will fight aggressively for you, your children, assets, and future both inside and outside of the courtroom.


Practice Areas

Licensed since 1985

  1. Divorce & Separation: 40%
    28 years
  2. Family: 20%
    28 years
  3. Adoption: 15%
    28 years
  4. Child Custody: 15%
    28 years
  5. Child Support: 10%
    28 years



Hourly ($250-425/hour), Fixed (Sometimes), Retainer (Always)

Payment Types:

Cash, Check, Credit Card

Attorney Endorsements

20 total 

  • No photo

    I highly endorse Mark Williams. We have had a case opposite each other, and he worked hard to resolve tough issues. Mark is a great negotiator who puts his client’s interests first.


    Gerald Tadlock Family Attorney
    Relationship: Opposing Counsel on matter

  • Kathryn Lanigan Pruitt

    Mark is an extremely intelligent, creative and aggressive advocate. He will not back down from a tough case, and he is at home in the courtroom. I endorse this lawyer.


    Kathryn Pruitt Divorce & Separation Attorney
    Relationship: Opposing Counsel on matter

Contact Info

Williamson Law Firm, PLLC

16633 North Dallas Parkway
Suite 290
Addison, TX, 75001



TXEligible To Practice In Texas 198508/25/2015

Professional Misconduct

We have not found any instances of professional misconduct for this lawyer.

Avvo Contributions

Legal Answers


Award NameGrantorDate Granted
Top AttorneyTexas Monthly Magazine2015
AV Preeminent 5.0 out of 5 Peer Review RatedMartindale-Hubbell2015
Texas Super LawyerTexas Monthly Magazine2015
Texas Super LawyerTexas Monthly Magazine2014
AV Preeminent 5.0 out of 5 Peer Review RatedMartindale-Hubbell2014
Top AttorneyTexas Monthly Magazine2014
AV Preeminent 5.0 out of 5 Peer Review RatedMartindale-Hubbell2013
Top AttorneyTexas Monthly Magazine2013
Texas Super LawyerTexas Monthly Magazine2013
Texas Super LawyerTexas Monthly Magazine2012

Work Experience

TitleCompany NameDuration
OwnerThe Williamson Law Firm, PLLC2008 - Present
President and founderWilliamson, Wewers & Schmideke, PC2001 - 2008
President and founderWilliamson & Associates, PC1991 - 2001


Association NamePosition NameDuration
American Inns of CourtBarrister2007 - Present
Collin County Bar AssociationN/A2000 - Present
Dallas Bar Association, Family Law SectionN/A1997 - Present
State Bar of Texas, Family Law SectionN/A1997 - Present

Legal Cases

Case NameOutcome
In Re A.B.A.T.W Dallas 5th Court of AppealsAppeal court ruled in client favor.
Brennan v. Cedeno 14th Court of Appeals-Fort WorthOverruled in client's favor, remanded back to trial court.

See all Legal Cases 


School NameMajorDegreeGraduated
University Of TexasDoctor of Jurisprudence/Juris Doctor (J.D.)law1985
Baylor UniversityAccountingBBA1982