Mary Beth Sullivan

Attorney Mary Beth Sullivan

About Mary Beth

Mary Beth Sullivan is a Partner at Sullivan, Klocke & Williamson and has been licensed since 2013. Mary Beth is a graduate of Oklahoma City School of Law and was also a visiting student at the University of Memphis Cecil C. Humphrey’s School of Law. Mary Beth earned her bachelor’s degree in History from Christian Brothers University in Memphis, Tennessee where she clerked for the Honorable Judge Robilio in the Shelby County Circuit Court, District V.

Mary Beth’s uncanny intuition and ability to zealously advocate for her clients’ rights is second to none. Mary Beth is charming, yet fierce and strives to achieve the best possible result for each of her clients. With extensive experience in legal negotiations, Mary Beth is adept at analyzing potential exposure and minimizing risk through a measured litigation plan.

As a mother of three, Mary Beth is relatable, compassionate and truly understands how emotionally taxing family law litigation can be for parents and children. She goes above and beyond to clearly communicate and provide peace of mind to each client as they walk through one of the most challenging and emotional times of their lives.

Mary Beth is a member of the Collin County Bar Association, and the family law sections of the Dallas Bar Association and the State Bar of Texas. Her practice is exclusively focused on family law matters. Mary Beth is licensed in both Texas and Tennessee.

Professional Associations

  • Texas Bar Association, Family Law Member
  • Dallas Bar Association, Family Law Member
  • Collin County Women’s Bar Association
  • Collin County Bar Association, Family Law Member
  • Texas Trial Lawyers Association


Oklahoma City University School of Law, Oklahoma City, Oklahoma

  • J.D. – 2013
  • Honors: Dean’s List

Christian Brothers University, Memphis, Tennessee

  • B.A. – 2009
  • Major: History

Bar Admissions

  • Tennessee, 2013
  • Texas, 2016


  • Phi Alpha Theta
  • Alpha Xi Delta

Avvo Top Attorney badge for Mark Rush Williamson

Avvo Rating: 10.0 – Top Attorney

SuperLawyers badge for Mark Rush Williamson

Rated by Super Lawyers