John G. Williamson
Associate / Bay Area Houston Office

John Williamson is member of the firm’s litigation group, and concentrates his time on Commercial Litigation disputes.

John is a proud graduate of Rice University where he played four years of Division I baseball, and studied Political Science. John was drafted in the 23rd round of the 2015 Major League Baseball Draft following his senior year and played three seasons in the Chicago Cubs minor league system, serving as a left-handed relief pitcher. Following his baseball career, he chose to pursue the practice of law, following in his father’s footsteps, who was a successful trial attorney in Houston, Texas. In October 2020, John became eligible for MLBPA certification as a Player Agent. John’s professional sports background and volunteer baseball coaching for West University Little League has helped him achieve a unique perspective on the collaborative, yet competitive, nature of litigation.

John began his career as a student attorney working for two legal clinics, the Consumer Law Clinic and the Entrepreneurship and Community Development Clinic, where he was able to provide supervised legal services to a variety of clients in the Greater Houston area. John now focuses his legal practice on representing a variety of clients involved in commercial litigation disputes. John has represented both large companies and small businesses, both as plaintiff and defendant. In addition to his litigation practice, John advises his clients regarding estate planning and the probate process. John’s passion is empowering others, and he enjoys doing so through his law practice at Greer Herz and Adams.


  • University of Houston Law Center – J.D., Cum Laude
  • Rice University – Bachelor of Arts in Political Science
  • University of North Carolina, Chapel Hill – Master of Public Administration


  • Texas (99th percentile UBE score)
  • United States District Court for the Southern District of Texas

Professional Activities & Memberships

  • State Bar of Texas
  • American Bar Association

Representative Cases

  • Represented nationally-chartered bank on appeal in a case involving the characterization of a $50 million estate and obtained a favorable outcome for the client.
  • Currently serving as trial counsel for insurance company facing a reinsurance claim dispute.
  • Currently serving as trial counsel for turf installation company facing breach of contract claim.
  • Currently serving as trial counsel for commercial landlord involved in a lease dispute.
  • Represented local restaurant facing a six figure lawsuit from a supplier and secured a favorable settlement for the client based on the presentation of client’s counter-claims.
  • Represented nationally chartered bank at trial in Harris County and obtained favorable result.
  • Negotiated and secured a favorable settlement pre-litigation, including client’s attorney’s fees, related to engine damage sustained to client’s vehicle caused by an automobile repair shop’s negligence.
  • Represented commercial property owner facing a suit by municipality for demolition of property and imposition of fines and secured a dismissal of the suit with no assessment of fines.
  • Recovered and collected judgment for turf installation company pursuing a breach of contract claim.
  • Represented and advised insurance company regarding HIPAA compliance in connection with numerous subpoenas for insurance records.
  • Assisted in drafting of petition to the Texas Supreme Court.
  • Advised client regarding estate planning and probate processes.
  • Obtained, and collected on, a favorable judgment for a litigation client, arising out of a breach of contract claim.
  • Obtained a favorable judgment for a litigation client, arising out of a breach of contract and suit on sworn account claim.
  • Advised national bank regarding repossession of motor vehicle and warranty issues during resale.
  • Secured a favorable settlement on behalf of client regarding DTPA claims related to damaged and/or lost consumer goods.
  • Advised local marina regarding legal remedies pertaining to delinquent boat slip payments and transfer of title from Texas Parks and Wildlife.
  • Represented homeowner in HOA dispute.
  • Obtained a summary judgment for a litigation client, arising out of a personal injury claim.
  • Successfully argued a Motion to Transfer Venue on behalf of a defendant in an alleged breach of contract claim.
  • Obtained a favorable settlement pre-litigation, arising out of a DTPA claim against a publicly traded corporation.
  • Obtained a favorable settlement pre-litigation, arising out of a property damage claim.
  • Obtained a favorable settlement pre-litigation, arising out of a property damage claim related to the theft of a catalytic converter.
  • Advised corporate client numerous times regarding contestability of life insurance policies.

Civic Involvement

  • Head Coach of Texans 12U Baseball Team