Kait O'Connor


  • JD, cum laude, Harvard Law School, 2013; Co-Editor-In-Chief, Harvard National Security Journal
  • AB (Government), magna cum laude, Harvard College


  • Massachusetts, 2013

Court Admissions

  • U.S. District Court for the District of Massachusetts

Kait O'Connor


Kait O’Connor represents companies and individuals facing complex civil litigation in federal and state court. Kait serves clients from a wide array of industries, including pharmaceutical companies, healthcare providers, private equity firms, financial services firms, beverage companies, airfreight companies, and entertainment providers. She works on all phases of litigation, including dispositive motions, discovery, settlement, trial, and appeals, and has experience in many substantive areas of law including antitrust, the Securities Act, the Securities Exchange Act, contract disputes, data breaches, Title VII, the False Claims Act, the Foreign Corrupt Practices Act, and class actions.

Kait maintains an active pro bono practice in trial and appellate work. Most recently she was a member of a trial team that successfully challenged the constitutionality of the Massachusetts’ voter registration deadline before the Massachusetts Superior Court. Previously, Kait represented a not-for-profit organization in an appeal before the Massachusetts Appellate Division and the Massachusetts Appeals Court. Kait also enjoys providing limited assistance representation as part of the Lawyer for the Day program at the Housing Court in Boston.


Since joining Ropes & Gray in 2013, Kait has represented clients in all stages of complex commercial disputes. Her litigation experience includes:

  • Defending a not-for-profit hospital and individual doctor against allegations of employment discrimination and retaliation in the District of Massachusetts. 
  • Representing underwriters against allegations of Securities Act violations in the Southern District of New York in the context of larger fraud claims brought against the issuing company for alleged noncompliance with GAAP in financial statements. 
  • Representing a Fortune 500 airline in defense of a class action involving allegations of price fixing in the Eastern District of New York, including extensive work with retained experts to understand and successfully undermine Plaintiffs’ complex statistical damages model.
  • Defending a global pharmaceutical company in a False Claims Act litigation in the District of Massachusetts, including work preparing witnesses to testify at trial.
  • Representing a Fortune 500 company in defense of a class action litigation resulting from computer network intrusions in the Southern District of California. Work encompassed implementing and receiving final court approval of a settlement agreement, and personally overseeing a class notification involving millions of class members and a complex claims administration process. 
  • Representing an institutional client, bringing claims of conversion and replevin against a former employee who failed to return electronic files. Received complete relief for client at summary judgment. 

Kait also has experience representing clients in internal and government investigations, including:

  • Representing a company undergoing an SEC inquiry, resulting in closure of the SEC probe without an enforcement action.
  • Providing counsel to a technology firm’s audit committee, examining financial statements including non-GAAP metrics.
  • Representing an individual client before the Massachusetts Department of Revenue.
  • Representing a global pharmaceutical company under investigation for alleged violations of the Foreign Corrupt Practices Act.
  • Representing a pharmaceutical company under multi-state attorney general investigation for historical promotional practices.