Brian L. Duffy

Brian L. Duffy

Chief Executive Officer

Brian L. Duffy is the firm's Chief Executive Officer and previously served as its Co-President and Chair of its Global Litigation Department. He focuses his practice on class action, employment, energy, commercial contract and product liability trials and appeals, serving as national counsel in high-profile cases throughout the country.


  • 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 issue.
  • 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.

Recognition & Leadership

  • Listed, The Best Lawyers in America, Commercial Litigation; Litigation - Labor and Employment, 2010-2015 and 2017-2018
  • Listed, Super Lawyers magazine, Colorado Super Lawyers, 2006-2016
  • Team Member, U.S. News - Best Lawyers®, Best Law Firms Edition, "Law Firm of the Year," Environmental Law, 2016
  • Recipient, "Alumni Award for Distinguished Achievement in Private Practice," University of Colorado Law School, 2015
  • Listed, Chambers USA Guide, 2013-2017
  • Rated, AV Preeminent® 5.0 out of 5

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, American Bar Association
  • Member, Colorado Bar Association
  • Member, Denver Bar Association
  • Member, Faculty of Federal Advocates


  • J.D., University of Colorado Law School, 1991
    • Order of the Coif
    • Notes and Comments Editor, University of Colorado Law Review
  • B.S., summa cum laude, University of South Dakota, 1988
  • Judge Jim R. Carrigan, 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