PRACTICE AREAS: 13
THE BEST LAWYERS IN AMERICA® AWARDS: 14
BEST LAWYERS: ONES TO WATCH® IN AMERICA AWARDS: 8
BEST LAW FIRMS® AWARDS: 11

Firm Details

Ahmad, Zavitsanos & Mensing, or AZA, is first and foremost a trial firm. Its more than 60 lawyers bring clients a formidable courtroom record in complex commercial litigation, including energy, trade secret, intellectual property, construction and real estate, environmental, class action, restrictive covenant, catastrophic injury, and business dispute cases. The firm's partners have tried more than 250 cases, and AZA has been in trial nearly every month since 2016.

AZA has earned a coveted rating for its Texas commercial litigation work in every edition of Chambers USA: America's Leading Lawyers for Business from 2014 through 2026. U.S. News & World Report and Best Lawyers have named AZA a Tier 1 firm in Commercial Litigation and Appellate in their Best Law Firms rankings, and Best Lawyers in America lists 14 AZA lawyers in Houston Commercial Litigation, more than any other firm. Benchmark Litigation, the definitive guide to America's leading litigation firms and attorneys, has recognized all three of AZA's name partners. Lawdragon has named 11 AZA lawyers to its 500 Leading Litigators in America, and more than half of the firm's attorneys were selected to the 2026 Texas Super Lawyers or Rising Stars lists.

Those rankings rest on results. AZA has secured one of the nation's top 50 plaintiff verdicts ten years running, obtained one of the top 10 IP verdicts in the country in 2025, and won the largest Harris County jury verdict in commercial litigation in 2024. Law360 named AZA a 2026 Regional Powerhouse, one of only five firms in Texas to earn the distinction, and Firm Prospects ranks AZA among the top 25 boutiques in the nation. Texas Lawyer has named AZA Litigation Department of the Year four times and inducted the firm into its Texas Verdicts Hall of Fame. And AZA is among the nation's "Most Feared" law firms, as identified by general counsel and in-house litigators surveyed by BTI Consulting.

Dedication to clients, coupled with the ability to prevail before judges and juries alike, is why general counsel across the country know AZA. Clients including Chevron, LyondellBasell, Halliburton, KBR, TotalEnergies, Transocean, and the Houston Rockets trust the firm with their most difficult matters, and AZA is often hired on the eve of trial, once it has become clear a case must be tried. It is also why corporate counsel have named AZA one of the firms with the best client service among those serving the Fortune 1000. In fact, AZA has been hired many times by the same companies it has beaten at trial.

PRACTICE AREAS: 13
THE BEST LAWYERS IN AMERICA® AWARDS: 14
BEST LAWYERS: ONES TO WATCH® IN AMERICA AWARDS: 8
BEST LAW FIRMS® AWARDS: 11
Office Administrator
Managing Partner
Air Liquide USA LLC
American Automobile Association
CITGO Petroleum Corporation
Columbia Gulf Transmission Company
Contango Oil & Gas Company
Enbridge Inc.
Genuine Parts Company
GreyStar Corporation
Holloman Corporation
Key Energy Services, Inc.
LoJack Corporation
Lyondell Chemical Company
Mercedes-Benz USA
Mistras Group, Inc.
National Oilwell Varco
NRG Energy
Plains All American Pipeline, L.P.
PSC
Versata, Inc.
Consultant
7138576560
Managing partner
713-655-1101
Office Administrator
Managing Partner
Air Liquide USA LLC
American Automobile Association
CITGO Petroleum Corporation
Columbia Gulf Transmission Company
Contango Oil & Gas Company
Enbridge Inc.
Genuine Parts Company
GreyStar Corporation
Holloman Corporation
Key Energy Services, Inc.
LoJack Corporation
Lyondell Chemical Company
Mercedes-Benz USA
Mistras Group, Inc.
National Oilwell Varco
NRG Energy
Plains All American Pipeline, L.P.
PSC
Versata, Inc.
Consultant
7138576560
Managing partner
713-655-1101
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Awards & Focus

Awards
  • AZA named among nation's "Most Feared" law firms
  • AZA named among nation's "Most Feared" law firms
  • Benchmark Litigation - Firm and three lawyers rated
  • Benchmark Litigation - Firm and three lawyers rated
  • AZA listed by Law360 among 10 boutiques “Giving BigLaw a Run for its Money”
  • AZA listed by Law360 among 10 boutiques “Giving BigLaw a Run for its Money”
  • BTI Client Service A-Team 2012 to firm AZA
  • BTI Client Service A-Team 2012 to firm AZA
  • 3 of Texas Top 2011 Verdicts on Both Sides of the Bar - Texas Lawyer
  • 3 of Texas Top 2011 Verdicts on Both Sides of the Bar - Texas Lawyer
  • Who's Who in Energy named 3 AZA Lawyers - Listed by 7 city business journals
  • Who's Who in Energy named 3 AZA Lawyers - Listed by 7 city business journals
  • Texas Super Lawyers - up to 7 to 13 lawyer on Rising Stars list for Texas
  • Texas Super Lawyers - up to 7 to 13 lawyer on Rising Stars list for Texas
  • Texas Super Lawyers - 3 AZA Lawyers Top 100 Texas, 4 AZA Lawyers Top 100 Houston
  • Texas Super Lawyers - 3 AZA Lawyers Top 100 Texas, 4 AZA Lawyers Top 100 Houston
  • U.S. News/Best Law Firms- AZA Tier 1 in Commercial Litigation
  • U.S. News/Best Law Firms- AZA Tier 1 in Commercial Litigation
  • U.S. News/Best Lawyers in America - 9 AZA Best Lawyers
  • U.S. News/Best Lawyers in America - 9 AZA Best Lawyers
  • BTI Client Service All-Star Team 2013 - John Zavitsanos
  • BTI Client Service All-Star Team 2013 - John Zavitsanos
  • BTI Consulting Group names AZA "Awesome Opponents"
  • BTI Consulting Group names AZA "Awesome Opponents"
  • Texas Intellectual Property Law Firm of the Year by firm clients and the publishers of Global Law Experts
  • Texas Intellectual Property Law Firm of the Year by firm clients and the publishers of Global Law Experts
  • Texas Super Lawyers - 9 AZA Lawyers named Texas Super Lawyers
  • Texas Super Lawyers - 9 AZA Lawyers named Texas Super Lawyers
  • AZA Earns Selection to Texas Verdicts Hall of Fame - Texas Lawyer
  • AZA Earns Selection to Texas Verdicts Hall of Fame - Texas Lawyer
  • Three AZA Attorneys Named to Who's Who in Energy List - Houston Business Journal
  • Three AZA Attorneys Named to Who's Who in Energy List - Houston Business Journal
  • Chambers USA: America's Leading Lawyers for Business - AZA among Best in Commercial Litigation
  • Chambers USA: America's Leading Lawyers for Business - AZA among Best in Commercial Litigation
  • Chambers USA: America's Leading Lawyers for Business - 3 AZA lawyers rated
  • Chambers USA: America's Leading Lawyers for Business - 3 AZA lawyers rated
  • Houston Law Firm AZA Named Among Largest Energy Practices by Houston Business Journal
  • Houston Law Firm AZA Named Among Largest Energy Practices by Houston Business Journal
Areas of Practice
  • Appellate Practice
  • Arbitration
  • Commercial Litigation
  • Construction Law
  • Employment Law - Management
  • Intellectual Property Law
  • Litigation - Antitrust
  • Litigation - Construction
  • Litigation - Intellectual Property
  • Mass Tort Litigation / Class Actions - Defendants
  • Patent Law
  • Personal Injury Litigation - Defendants
  • Personal Injury Litigation - Plaintiffs

Jurisdictions

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