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Brian L. Duffy assumed the role of Chief Executive Officer at Greenberg Traurig, LLP in January 2016. Previously Brian served as a firm President as well as Chair of the firm’s 600-member Global Litigation Department. A true “working CEO,” Brian focuses his practice on trial and appellate work in the class action, employment, energy, commercial contract, and product liability areas, serving as counsel in high-profile cases throughout the United States.

Greenberg Traurig has approximately 2300 attorneys and 1800 professional staff in 40 locations in the United States, Latin America, Europe, Asia, and the Middle East. The firm has been recognized for its philanthropic giving, diversity, and innovation, and is consistently among the largest firms in the U.S. on the Law360 400 and among the Top 20 on the Am Law Global 100. The firm is net carbon neutral with respect to its office energy usage and Mansfield Rule 3.0 Certified.

Brian is recognized for his inclusive and effective “big picture” leadership methods and personable communication style. He has helped further position the firm as a global, highly respected, diverse, and innovative “go to” firm for complex matters in some of most critical areas of practice, business markets, and industry sectors.

Editors at a legal directory recently published that Brian Duffy is recognized as a “superb trial lawyer and is noted for handling a broad array of litigation at both trial and appellate levels.” In a recent industry survey, clients describe Brian as, "responsive, trustworthy, and excellent in a crisis situation - he’s calm and knows what to do." The Denver Business Journal honored him with a Most Admired CEO award. Additionally, other leaders at top real estate and financial services organizations taking part in a research study noted that Brian “is responsive and uses a truly practical operational approach”; “is uber practical and has great suggestions and recommendations”; and is “highly skilled, proactive and knows how to put together the best teams for us.”

Under Brian as CEO, Greenberg Traurig has received important recognition reflective of his and the firm’s commitment to a diverse and quality workplace and legal profession. Brian empowers the leaders of the firm’s Diversity, Equity, and Inclusion Initiative and Global Pro Bono Program to create and implement best-in-class programs that address internal and community needs. These efforts include the independently recognized Greenberg Traurig Women’s Initiative and the firm’s dynamic Affinity Groups.

In 2020, Brian played a key role in Greenberg Traurig committing $5 million over five years to address causes and effects of systemic racism; joining the Law Firm Anti-Racism Alliance; instituting billable hours for diversity and inclusion related work, in addition to community and civic activities; launching the Justice Initiative with attorneys from across the firm to augment the firm’s justice oriented pro bono work by identifying new pro bono opportunities in the areas of racial, social, and economic justice; collaborating with clients on innovative diversity initiatives; and creating a Justice Action Academy, among other programs designed to further the firm’s focus on an inclusive and diverse workforce and legal profession.

The firm also achieved its Mansfield Rule 3.0 Certification, a program administered by The Diversity Lab and designed to boost diversity and inclusion within law firms and legal departments.

Also committed to addressing the firm’s carbon footprint, Brian supported the firm’s recent effort in green certification. In 2020, the non-profit Center for Resource Solutions (CRS) confirmed that Greenberg Traurig is the first major law firm to be certified through its Green-e® Energy program. In addition, CRS certified that Greenberg Traurig’s North American offices are powered by 100% renewable energy. The CRS Green-e® Energy program has been called the leading renewable energy certification program in the United States. Going beyond North America, the firm’s 40 offices are now net carbon neutral with respect to their office energy usage, and are 100% powered by renewable energy, achieved by the purchase of renewable energy certificates.

Brian holds a J.D. from the University of Colorado Law School, where he was honored as Outstanding Alumni in private practice. He received a B.S., summa cum laude, from the University of South Dakota.


  • Class action defense
  • Wage and hour claims
  • Breach of contract claims
  • Whistleblower defense
  • Global energy and infrastructure



  • Acted as lead defense counsel in multi-district litigation proceeding involving 35 putative wage and hour class actions.
  • Acted as national coordinating counsel for Fortune 50 company in defense of approximately 70 wage and hour class actions.
  • Acted as lead defense counsel in multi-district litigation proceeding involving approximately 50 putative consumer class actions arising out of the sale of motor fuel.
  • Defended over 200 class actions covering nearly every type of consumer and business.
  • Represented company in proceedings related to alleged violations of immigration laws, including governmental and internal investigations, related civil litigation and compliance programs.
  • Represented companies alleged to have violated the Foreign Corrupt Practices Act (FCPA), including design and implementation of compliance programs, and related internal investigations.
  • Represented major energy company in three-week breach of contract trial involving a defective piece of mining equipment, which resulted in judgment of $30 million in favor of our client.
  • Represented major pipeline company in seven-week jury trial arising out of a pipeline rupture and explosion, which resulted in the deaths of 12 people. The jury returned a defense verdict on all claims.

Anerkennung durch den Markt

  • Listed, Benchmark Litigation, "Litigation Star," 2022 
  • Listed, The Best Lawyers in America, Commercial Litigation; Litigation - Labor and Employment, 2010-2022
  • Team Member, a Law360 "Product Liability Practice Group of the Year," 2011
  • Listed, Acritas Stars™ Independently Rated Lawyers, “Star Lawyers,” 2018-2021
  • Listed, Chambers USA Guide, 2013-2020
  • Listed, Super Lawyers magazine, Colorado Super Lawyers, 2006-2018 and 2021
  • Recipient, Most Admired CEOs Award, Denver Business Journal, 2019
  • Recipient, "Alumni Award for Distinguished Achievement in Private Practice," University of Colorado Law School, 2015
  • Rated, AV Preeminent® 5.0 out of 5.0

°AV®, AV Preeminent®, Martindale-Hubbell DistinguishedSM and Martindale-Hubbell NotableSM are certification marks used under license in accordance with the Martindale-Hubbell® certification procedures, standards and policies.

  • Member, Out Leadership, Global Advisory Board
  • Member, American Bar Association
  • Member, Colorado Bar Association
  • Member, Denver Bar Association
  • Member, Faculty of Federal Advocates


Akademische Ausbildung
  • J.D., University of Colorado Law School
    • Order of the Coif
    • Notes and Comments Editor, University of Colorado Law Review
  • B.S., summa cum laude, University of South Dakota
Referendariat / Praktika
  • U.S. District Court for the District of Colorado
  • Colorado
  • New York
  • U.S. Court of Appeals for the Ninth Circuit
  • U.S. Court of Appeals for the Tenth Circuit
  • U.S. District Court for the District of Colorado