O’Melveny Worldwide

Colleen Powers represents clients in a wide range of matters including antitrust litigation, securities litigation, insurance coverage, bankruptcy matters, Foreign Corrupt Practices Act investigations, class actions, contract/commercial disputes, and matters before the US International Trade Commission (ITC). Colleen has broad litigation experience in discovery matters, preparing for depositions (including fact witnesses and experts), drafting dispositive motions, and preparing for trial. 

Colleen has extensive experience representing clients in complex antitrust matters. Colleen was a key member of the team that helped secure a victory for C. R. Bard, Inc. in a Sherman Act Section 1 tying case brought by a competing provider of medical devices. Just a few months prior to the Bard trial, Colleen helped US Airways secure a victory in a multi-week jury trial in which the jury found Sabre liable for violating the Sherman Act, Section 2. Additionally, Colleen played a lead role in coordinating and analyzing discovery in an ongoing multi-bank antitrust class action.

In her pro bono practice, Colleen devotes time advocating for voting rights and indigent clients, including participating in a week-long evidentiary hearing to overturn a death sentence which the state of Texas ultimately determined was unconstitutional, securing a favorable settlement in a civil rights matter, and drafting a Second Circuit brief challenging the denial of immigration relief for a client seeking asylum.

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  • Represented American Airlines in US Airways, Inc. v. Sabre Holdings Corp., et al., Case No. 1:11-cv-2725 (S.D.N.Y.), in a six-week jury trial in which trial team secured a successful jury verdict against Sabre finding that Sabre illegally maintained its monopoly power in the Sabre distribution market.
  • Represented C. R. Bard, Inc. in AngioDynamics v. C. R. Bard, Inc., Case No. 1:17-cv-00598-BKS-CFH (N.D.N.Y.), a Sherman Act Section 1 tying case brought by a competing provider of medical devices. After a three week jury trial, the jury determined that the plaintiff failed to prove that the defendants were liable for any claim.  
  • Representing C. R. Bard in a related Sherman Act class action brought by North Brevard County Hospital District in Florida on behalf of a nationwide class of hospitals that purchased Bard catheters; a motion to transfer to the District of Utah was granted in March 2022, North Brevard County Hospital District v. C. R. Bard, et al., 2:22-cv-00144-RJS-JCB (D. Utah).
  • Representing Royal Bank of Canada in antitrust litigation, City of Philadelphia v. Bank of America, Corp. (S.D.N.Y.), in which plaintiffs allege, principally, a Section 1 violation by defendants in connection with resetting rates of VRDO municipal bonds.


Bar Admissions

  • New York
  • New Jersey

Court Admissions

  • US District Court, New Jersey
  • US Court of Appeals, Second Circuit


  • Fordham University, J.D., 2016: magna cum laude; Notes and Articles Editor, Fordham Urban Law Journal; Member, Brendan Moore Trial Advocacy Program
  • University of Central Florida, Psychology/Sociology, B.A., 2012: magna cum laude

Professional Activities


  • The Honorable Claire C. Cecchi, US District Court, New Jersey
  • The Honorable Leda Dunn Wettre, US District Court, New Jersey