Mary Beth Sullivan, Associate Attorney in Dallas

Attorney Mary Beth Sullivan

About Mary Beth

Mary Beth Sullivan is an associate attorney at Williamson Law Firm and an active member of the Dallas and Collin County areas. Mrs. Sullivan 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.

Mrs. Sullivan earned her Juris Doctorate from Oklahoma City School of Law. Mrs. Sullivan was also a visiting student at the University of Memphis Cecil C. Humphreys School of Law where she received the CALI Excellence for the Future Award for scoring the highest grade in Employee Benefits.

With extensive experience in legal negotiations, Mrs. Sullivan works hard to understand her clients’ goals and advocate in their best interest. As a mother herself, she understands how emotionally taxing family law litigation can be and strives to provide peace of mind to each client through clear communication and management of expectations.

In her free time, Mrs. Sullivan enjoys cooking and hosting for family and friends. With a toddler and twin boys, she is constantly on her toes and has ample experience building with Legos, shooting Nerf guns and racing Matchbox cars.

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

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Rated by Super Lawyers