John T. "Trey" Cox III

Energy Regulatory Law

5.0 (1 reviews)

Fort Worth, Texas

15+ years experience

Updated: Jan 04, 2026

Contact Information

214-698-3100

https://www.gibsondunn.com/lawyer/cox-trey/

2001 Ross Avenue, Suite 2100 Dallas TX US

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Bio

Representing clients in Energy Regulatory Law cases, John T. "Trey" Cox III practices in Texas. John T. "Trey" Cox III's practice spans over 15 years, focusing on achieving favorable outcomes in Energy Regulatory Law. At Gibson, Dunn & Crutcher LLP, John T. "Trey" Cox III focuses on Energy Regulatory Law matters. T. "Trey" Cox III is committed to delivering results while treating clients with respect and dignity. Clients value John T. "Trey" Cox III's honest assessments and practical legal solutions. T. "Trey" Cox III maintains active licensure in Texas and stays current with legal developments.

Practice Areas

Energy Regulatory Law

Awards & Recognition

Lawyer of the Year: Energy Regulatory Law, Dallas/Fort Worth (2026)
Recognized: Commercial Litigation
Recognized: Energy Regulatory Law
Recognized: Litigation - Intellectual Property
Recognized: Litigation - Securities
Practice Area: Arbitration
"Leader in His Field" in Chambers & Partners’ Chambers USA Guide to Leading Lawyers – General Commercial Litigation (Texas), 2009-2011
Listed as a "Texas Super Lawyer" by Law & Politics (as seen in Texas Monthly), 2004-2011
Selected by The Dallas Business Journal as a "Defender" in 2008, and "One of the 10 Metroplex Litigators Worth Having on Your Side"
Recognized by his peers in D Magazine as a "Best Lawyer Under 40" for five consecutive years
AV-rated by Martindale-Hubbell
Named one of the "Best and Brightest Business Leaders" in The Dallas Business Journal’s "40 Under 40" survey

Recognized in Best Lawyers since 2010

Education

University of Virginia, J.D., graduated 1995
Washington and Lee University, graduated 1992
University of Virginia, graduated 1995

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Reviews

Benjamin Ramirez

2 weeks ago

Exceptional Counsel for Complex Energy Regulatory Disputes

We engaged Trey Cox at Gibson Dunn for a high-stakes FERC compliance matter. His deep expertise in Energy Regulatory Law, honed over 15 years in Texas, was immediately evident. Trey provided a clear, strategic path through a complex proceeding, and his recent recognition as 'Lawyer of the Year' is well-deserved. His professionalism and command of the regulatory landscape were instrumental in achieving a highly favorable settlement. I recommend him without reservation to any entity facing significant energy regulatory challenges.