Meet Diana Marshall
Board Certified Civil Trial Lawyer, AAA Arbitrator, and Neutral Mediator
Diana Marshall is a seasoned civil trial attorney, arbitrator, and mediator based in Houston, Texas, with decades of experience resolving complex, high-stakes disputes. Universally recognized as a powerhouse in the Texas legal community, Diana has handled hundreds of cases in state and federal courts and successfully tried over 100 cases to a jury verdict.
Breaking barriers early in her career, she was the first female partner at Baker Botts LLP—where she spent 21 years honeing her elite litigation skills—before founding her own highly regarded boutique litigation firm. Named by TIME magazine as one of the top five women trial lawyers in America, and recognized by the National Law Journal among the “50 Most Influential Women Attorneys in the U.S.,” Diana brings an unparalleled depth of courtroom perspective to the alternative dispute resolution (ADR) landscape.
Today, she leverages this legendary trial foundation to design and optimize strategic paths forward for her clients, focusing her practice entirely on Arbitration and Mediation.
Areas of Expertise & Strategic Focus
Diana’s ADR practice is grounded in deep technical knowledge and analytical precision. She primarily serves as an arbitrator and mediator across several complex, high-consequence industries:
- Commercial Litigation & Partnerships: Resolving intense business, contract, probate, and corporate disputes.
- Energy, Oil & Gas: Navigating high-value infrastructure, operational, and contractual conflicts common to the Texas energy sector.
- Construction: Addressing defect claims, delay disputes, and multi-party commercial building conflicts.
- Environmental Clean-Up: Managing highly technical, legally dense environmental liability and remediation claims.
Credentials & Honors
Board Certified in Civil Trial Law
Texas Board of Legal Specialization
Fellow
The American College of Trial Lawyers
Texas Super Lawyer
2003 – 2022
Member
American Law Institute (ALI)
Member
American Board of Trial Advocates (ABOTA)
A Note on Transparency & Value
Legal disputes demand clarity, predictability, and efficiency. Diana structures her ADR services with transparency in mind. If a complex matter or unique administrative burden exceeds what is fairly covered by a standard flat fee, she remains committed to open communication and maintaining a highly reasonable approach to ongoing costs.
Arbitration Services
Diana is an accomplished arbitrator and a trusted panelist for the American Arbitration Association (AAA). Renowned for her efficiency, fair-mindedness, and mastery of complex discovery processes, she serves across multiple arbitral structures
Sole Panelist
Managing and deciding cases independently from inception to final award.
Panel Chair
Leading three-member panels, streamlining procedures, and coordinating complex rulings.
Party-Selected Arbitrator
Serving as a reliable, strategic choice for multi-member panels requiring deep industry insight.
Mediation Framework (In-Person & Virtual)
As a mediator, Diana is an exceptionally hard-working advocate for fair resolution, famous for her stamina and persistence—having previously guided environmental mediations lasting up to 90 working days. She designs tailored resolution environments to meet the geographical and logistical needs of modern litigation
In-Person Mediations
Conducted in a professional, neutral environment focused on breaking intense legal impasses.
Zoom & Virtual Mediations
Diana is highly adept at managing digital boardrooms, having successfully facilitated complex, multi-party, nation-wide settlements completely via Zoom. Her virtual framework ensures that distance is never a barrier to a sustainable, court-admissible resolution.