Casey O’Neill is a trial lawyer and former federal prosecutor who represents companies, executives, boards, investment firms, and other clients in white collar criminal and other government enforcement matters, and in private civil litigation. His government enforcement practice includes insider trading and other securities fraud cases, cryptocurrency and digital asset matters, bank, wire, and tax fraud cases, money laundering and sanctions cases, and Foreign Corrupt Practices Act investigations. Alongside his enforcement work, Casey handles private civil litigation involving securities, fiduciary, and complex commercial disputes.
Before entering private practice, Casey served as a federal prosecutor with the U.S. Department of Justice’s Criminal Division, Fraud Section, Securities and Financial Fraud Unit. He led investigations and prosecutions involving insider trading, securities fraud, bank fraud, tax fraud, procurement fraud, and investment fraud in jurisdictions across the United States.
Casey also served in the Criminal Division of the U.S. Attorney’s Office for the Northern District of California. He managed investigations from their earliest stages through trial, handled matters for the Economic Crimes and Securities Fraud Unit, and tried multiple cases to jury verdict. His work included organized crime, financial crime, and general criminal matters.
Earlier in his career, Casey represented public and private companies, investment managers, and individuals in white collar criminal and civil matters at a large international law firm. His work included major insider trading cases, securities litigation arising from the financial crisis, and cross-border cartel and bribery investigations.
Casey also served on assignment with the United Nations’ International Criminal Tribunal for Rwanda, where he supported the prosecution of a senior military official in connection with crimes committed during the Rwandan genocide.
He previously clerked for Judge Nelson S. Román of the U.S. District Court for the Southern District of New York.
Education & Credentials
Education
Boston University School of Law
J.D.- magna cum laude
Georgetown University Law Center
L.L.M.- with distinction
University of San Diego
B.A.- summa cum laude
Bar Admission
Acknowledgements
- “Rising Star,” Criminal Defense: White Collar, Super Lawyers, 2017 – Present
- “Rising Star,” Irish Legal 100, 2018
- “Rising Star,” Enforcement and Compliance, Ethisphere Magazine, 2015 – 2016
- “Top 50 Under 40,” New York Law Journal, 2015
Prominent Assignments
• Represented Special Committee of Intel Corporation’s board in internal investigation re cybersecurity matter.
• Defended LendingClub Corporation in response to accounting-related securities class-action litigation.
• Represented Wells Fargo Bank employees in response to bank audit committee and government investigaitions.
• Defended decentralized autonomous organization (TRON Foundation) and Justin Sun in cryptocurrency-related litigation with the SEC and private plaintiffs.
• Defended the Galleon Group in relation to criminal insider trading matter, United States v. Rajaratnam.
• Defendant Todd Newman in criminal insider trading matter, United States v. Newman.
• Defended Merrill Lynch in securities and derivative litigation and investigations arising from Bank of America merger.
• Defended Countrywide Financial Corp. in nationwide residential mortgage-backed securities litigation.
Professional Involvement
- Member, Federal Bar Association’s Northern District of California Chapter
- Member, Federal Bar Council's Criminal Sentencing Committee
- Member, White Collar Crime Committee of the National Association of Criminal Defense Lawyers
- Advisory Board Member, White CollarLaw360
Publications/Presentations
- “U.S. Department of Justice's Deconfliction Policy – Ripe for Review,” N.D. Cal. ABTL Report, 2021
- “Alleged ICO Fraud Highlights Compliance Considerations,” Law360, 2020
- “WrkRiot: Rite of Passage or Federal Offense?,” Law360, 2017
- “Fewer Corporate Prosecutions: A More Effective Approach?” Law360, 2012