O’Melveny Worldwide

Hannah Dunham is a litigator in O’Melveny’s Los Angeles office who specializes in white collar defense and healthcare litigation. Hannah provides representation for a variety of corporations involved in criminal investigations and internal investigations. She also maintains an active civil litigation practice, with a particular focus on False Claims Act litigation.

Hannah’s clients span a variety of industries including the health care and financial services sectors, among others. Hannah carefully guides her clients through their sensitive matters and works diligently to ensure they receive the best representation and favorable outcomes.

Hannah also has a thriving pro bono practice, through which she represents a variety of clients, including in immigration, constitutional law, and criminal matters.

  • Represents corporate healthcare clients in connection with federal False Claims Act litigation
  • Represents a major financial institution in connection with federal False Claims Act litigation
  • Regularly counsels clients regarding False Claims Act compliance issues
  • Represented corporate and individual clients in connection with criminal investigations by the Department of Justice and local United States Attorneys Offices
  • Represented a large university system in a highly sensitive internal investigation
  • Represented a major corporation in a high profile internal financial investigation


Bar Admissions

  • California
  • District of Columbia

Court Admissions

  • US Court of Appeals for the Fourth Circuit


  • University of Virginia, J.D.; Production Editor, Virginia Tax Review
  • Claremont McKenna College, B.A.

Professional Activities


  • “Cybersecurity Challenges and the False Claims Act: Insights from the SuperValu Decision,” ABA White Collar Crime Committee Newsletter (July 2023)