David A. O’Neil is a litigation partner and member of the firm’s White Collar & Regulatory Defense Group. Recommended by Chambers USA (2022) and The Legal 500 US (2022) as a leading lawyer in White Collar Crime & Government Investigations and International Litigation, his practice focuses on white collar criminal defense, internal investigations, anti-corruption and FCPA defense and congressional investigations. In both 2018 and 2020, Mr. O’Neil was recognized as a Litigation Trailblazer by the National Law Journal and he was named a White Collar MVP by Law 360 in 2018. In Chambers USA (2022), clients report that he is an “extraordinary lawyer with experience and technical knowledge” and is the “rare and valued combination of brilliant lawyer, fearless strategist and exceptional leader.” He has also been described as “driven,” “practical,” “responsive and sharp.” Mr. O’Neil is also recommended for compliance and investigations by The Legal 500 Latin America (2022).
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 in January 2015, 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, where he was responsible for supervising more than 600 attorneys investigating and prosecuting the full range of federal crimes, including corporate malfeasance, cybercrime, fraud offenses and money laundering. Mr. O'Neil also served as Deputy Assistant Attorney General for the Fraud Section. In that capacity, he supervised more than 100 prosecutors engaged in nationwide enforcement of the FCPA, healthcare fraud and securities and financial fraud.
Before moving to the Criminal Division, Mr. O’Neil served for three years as Senior Associate Deputy Attorney General and Chief of Staff to the Deputy Attorney General, the Department's second-in-command. In that role, he was part of DOJ’s core management team, with direct supervisory responsibility for more than two dozen attorneys. He participated in a broad range of high-profile matters, including significant FCPA prosecutions, the LIBOR investigations, and high-profile investigations of financial institutions for money laundering and Bank Secrecy Act violations.
In 2009, Mr. O’Neil served as Assistant to the Solicitor General. He argued three cases in the U.S. Supreme Court, authored more than 50 briefs filed with the Supreme Court, and handled appeals from high-profile white-collar criminal convictions.
Mr. O’Neil began his career at DOJ as a federal prosecutor in the U.S. Attorney’s Office for the Southern District of New York. As an Assistant U.S. Attorney, he tried numerous cases to successful jury verdicts and argued several appeals. He worked on multiple cases involving financial institutions, including bank fraud, mortgage and identity-theft matters.
Mr. O’Neil earned his J.D. magna cum laude in 2000 from Harvard Law School, where he was an editor of the Harvard Law Review. He graduated from Princeton University with a B.A. magna cum laude in 1995.
Upon graduation from law school, he clerked for two years, first for Judge Robert D. Sack of the U.S. Court of Appeals for the Second Circuit and then for U.S. Supreme Court Justice Ruth Bader Ginsburg.
David A. O’Neil律师是诉讼业务合伙人，以及本所白领犯罪和合规辩护部门成员。他受到《美国钱伯斯》（2021年）和《美国法律500强》（2021年）的推荐，被评为“白领犯罪和政府调查”以及“国际诉讼”领域的杰出律师。O’Neil律师的执业领域主要为白领犯罪辩护、内部调查、反腐败与FCPA辩护以及国会调查。他在2018和2020年均被《国家法律期刊》（National Law Journal）评为“诉讼领域之先驱”，在2018年被《法律360》评为“白领犯罪领域最具价值律师”。客户在《美国钱伯斯》（2020年）中称赞O’Neil律师“主动、务实，鲜有人能提供他所提出的常识和解决重点”，并表示他“反应迅速，思维敏捷，能立刻发现关键问题所在，并快速进行分析、分解以解决问题。”O’Neil律师还获得《拉美法律500强》（2021年）在合规与调查领域的推荐。
从法学院毕业后，他曾在两年期间担任美国联邦第二巡回法院上诉法院Robert D. Sack法官书记员，后曾担任美国最高法院Ruth Bader Ginsburg法官的书记员。