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David A. O’Neil is a litigation partner at Debevoise & Plimpton and member of the firm’s White Collar & Regulatory Defense Group. Recommended by Legal 500 US (2018), his practice focuses on white collar criminal defense, internal investigations, privacy and cybersecurity, congressional investigations and AML/sanctions enforcement defense. In 2018, Mr. O’Neil was recognized as a “Litigation Trailblazer” by the National Law Journal and a “White Collar MVP” by Law 360. He is also recognized by Chambers USA and Legal 500 (2018) as a leading lawyer in White-Collar Crime & Government Investigations.

Mr. O’Neil has a unique practice focused on representing clients in high-stakes matters involving significant legal, political and public relations implications. His experience spans criminal investigations by the U.S. Department of Justice and foreign law enforcement bodies, sensitive, confidential internal investigations for high-profile companies, investigations by the United States Congress, litigation brought by state Attorneys General and class action lawsuits.

Prior to joining Debevoise, Mr. O’Neil served for eight years in prominent positions within the Department of Justice. In early 2014, the President and Attorney General designated Mr. O’Neil to lead the Criminal Division. Mr. O'Neil also previously served as Deputy Assistant Attorney General for the Fraud Section.