Adam B. Siegel

Attorney

Adam has been practicing criminal law for more than thirty years.

Adam was a partner for over twenty years at two of the world’s leading international law firms. During his sixteen-year tenure at his most recent firm, Adam was co-head of the firm’s global investigations and U.S. litigation practices and served as U.S. Managing Partner.

Clients in a broad range of industries rely on Adam to defend them in investigations conducted by the U.S. Department of Justice, the Securities and Exchange Commission, Multilateral Development Banks and state Attorneys General.

Adam’s matters have involved all manner of criminal and regulatory investigations, including alleged violations of the Foreign Corrupt Practices Act, sanctions and other trade laws, accounting fraud, tax fraud, consumer fraud and insider trading. He has particular expertise in cross-border investigations, having worked on matters in dozens of jurisdictions around the world.

Adam also undertakes internal investigations, conducts due diligence regarding bribery and other risks in proposed transactions, and helps clients develop and implement compliance programs.

Earlier in his career, Adam was an Assistant United States Attorney in the U.S. Attorney’s Office for the Southern District of New York, where he prosecuted a wide variety of cases and served as Deputy Chief and Chief Appellate Attorney. In these roles, Adam supervised and argued dozens of criminal appeals in the Second Circuit and helped shape the Office’s legal strategies and positions.

Education

  • Harvard Law School, J.D. magna cum laude 1994
  • Harvard College, A.B. magna cum laude 1990

Recognitions

  • Ranked by Chambers & Partners for White Collar and Government Investigations for 14 years; Band Two in 2025 rankings

Clerkship

  • Law Clerk for the Honorable Morey L. Sear, Eastern District of Louisiana