Jonathan N. Halpern is a partner and experienced litigation attorney in the firm's White Collar Defense and Investigations Practice, based in New York.

A former federal prosecutor in the Southern District of New York, Mr. Halpern is a seasoned litigator with extensive experience conducting corporate investigations, litigating complex criminal and civil matters, and trying jury cases to verdict. He represents clients in internal and government investigations in a wide array of criminal and compliance issues. Institutional and individual clients turn to Mr. Halpern to defend them in investigations of international bribery, false claims and other healthcare issues, insider trading, securities, commodities, tax and financial fraud as well as sexual assault and workplace harassment. A legal counselor, strategist and problem solver, Mr. Halpern is a fierce advocate and tenacious negotiator both behind the scenes and in court.

In addition to defending clients at trial and on appeal, Mr. Halpern represents clients in matters before U.S. attorney's offices, including cases in U.S. District Court in the Southern and Eastern Districts of New York, the U.S. Department of Justice, state attorney general's offices, the U.S. Securities and Exchange Commission, U.S. Commodities and Futures Trading Commission and the Treasury Department. His clients span diverse industries from financial services, technology, energy services, pharmaceutical and healthcare to media, manufacturing and retail.

Mr. Halpern counsels clients on a wide variety of criminal, compliance and enforcement issues, including allegations involving the Foreign Corrupt Practices Act (FCPA), false claims, complex fraud and financial transactions, antitrust violations, insider trading, securities fraud, sexual assault and workplace harassment. His practice also encompasses healthcare and medical practice issues, tax crimes, cybercrime, government contract fraud and art fraud.

Mr. Halpern handles substantial pro bono legal work, including immigration asylum cases, and he has successfully secured asylum for individuals seeking to escape persecution in their homelands. One escapee, who was arrested at the border and detained for approximately nine months, was granted asylum – and his freedom – after Mr. Halpern litigated his case and prevailed at trial. Mr. Halpern agreed to take the case after several lawyers had declined to do so. After extensive work by Mr. Halpern and a firm associate, another pro bono client recently was granted asylum for fear of being persecuted in a former Soviet republic because of his sexual orientation. For his commitment and work, Mr. Halpern has been named both a Holland & Knight 2019 Public & Charitable Service All Star and 2019 Pro Bono All Star.

Before returning to private practice, Mr. Halpern served as Assistant U.S. Attorney and chief of the Major Crimes Unit in the U.S. Attorney's Office for the Southern District of New York. As chief, he supervised approximately 25 experienced federal prosecutors in investigations and prosecutions of international bribery, money laundering, healthcare and tax fraud, computer crimes, Bank Secrecy Act violations and other complex, large-scale financial crimes. As a federal prosecutor, Mr. Halpern investigated and prosecuted white collar crimes involving public corruption, extortion, money laundering, federal tax violations, bank fraud, and wire, mail and healthcare fraud. He served as lead prosecutor in several high profile matters, including the investigation of the presidential pardon of Marc Rich, and supervised the investigation of corruption allegations in the United Nation's Oil for Food Program.

Mr. Halpern is frequently called upon to speak on criminal and civil litigation issues. He has provided legal analysis on television, and his legal commentary has appeared in The New York Times, The Wall Street Journal and the San Francisco Chronicle, among other publications.


  • Boston University School of Law, J.D.
  • Cornell University, A.B., cum laude
Bar Admissions/Licenses
  • District of Columbia
  • New York
Court Admissions
  • U.S. Court of Appeals for the Second Circuit
  • U.S. Court of Appeals for the Fourth Circuit
  • U.S. Court of Appeals for the Sixth Circuit
  • U.S. Court of Appeals for the Seventh Circuit
  • U.S. District Court for the Eastern District of New York
  • U.S. District Court for the Southern District of New York
  • U.S. District Court for the Western District of New York
  • U.S. Supreme Court
  • The Fund for Modern Courts, Board of Directors
  • New York State Bar Association, Committee on White Collar Criminal Litigation
  • New York City Bar Association
  • New York City Bar European Affairs Committee, Chair
  • Federal Bar Council, Committee on Sentencing and Alternatives to Incarceration
  • American Bar Association
  • National Association of Criminal Defense Lawyers
Honors & Awards
  • The Best Lawyers in America guide, Criminal Defense: White Collar, 2013-2020
  • Director's Award for Superior Performance, U.S. Department of Justice
  • Boston University International Law Journal, Editor-in-Chief


Speaking Engagements