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Mark Rush Williamson

also known as Mark Williamson

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


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



Hourly ($250-425/hour), Fixed (sometimes), Retainer (always)

Payment types:

Cash, Check, Credit card

Attorney endorsements

21 total 

Are you an attorney? Endorse this lawyer

  • Jeffrey Lee Fletcher

    I endorse this lawyer. Top Gun. Top Guy.


    Jeffrey Fletcher Family Attorney
    Relationship: Other

  • 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

Contact info

Williamson Law Firm, PLLC

16633 North Dallas Parkway
Suite 325
Addison, TX, 75001


TXEligible To Practice In Texas 198508/17/2016
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
Brennan v. Cedeno 14th Court of Appeals-Fort WorthOverruled in client's favor, remanded back to trial court.
In Re A.B.A.T.W Dallas 5th Court of AppealsAppeal court ruled in client favor.
See all legal cases 
School nameMajorDegreeGraduated
University of Texas School of LawDoctor of Jurisprudence/Juris Doctor (J.D.)JD - Juris Doctor1985
Baylor UniversityAccountingOther - Bachelors1982