John Marston

Partner - Washington, D.C.

John Marston
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Contact Information


202.785.6687 Download vCard

Former Washington, D.C. Assistant United States Attorney John Marston is a partner in Foley Hoag's Litigation Department. He focuses his practice on white collar criminal defense, government investigations, tax controversies, and litigation.

At the U.S. Attorney’s Office, John handled numerous fraud and violent crime cases. John served as first-chair trial attorney on more than forty-five cases in U.S. District Court and Superior Court and appeared regularly before D.C. federal and local grand juries where he presented hundreds of witnesses. As a senior fraud and corruption prosecutor, John conducted substantial investigations with numerous federal agencies across a range of subject areas including bankruptcy, tax, finance, antitrust, healthcare, and cyber security. Having obtained seven federal indictments and numerous arrests and pleas, he is well aware of the high burden the government faces in prosecuting a case. During his time as a federal prosecutor, John received multiple U.S. Attorney Special Achievement Awards, as well as Distinguished Service Awards from the Federal Bureau of Investigation and United States Postal Inspection Service.

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  • Cornell Law School, J.D., summa cum laude, Order of the Coif, 2004
  • Wheaton College, B.A., summa cum laude, 1999



Representative Experience

Criminal Defense and Investigations

  • Represented individual under investigation by U.S. Attorney’s Office for the District of Columbia.
  • Represented individual under investigation by federal law enforcement agencies and the U.S. Attorney’s Office for the Southern District of New York.
  • Advised non-U.S. energy company in connection with SEC and DOJ investigations of a domestic company.
  • Defended individual charged with multiple felony offenses in Maryland.
  • Defended individual on appeal from homicide conviction in Maryland.
  • Investigated alleged tax fraud perpetrated by principals of target company on behalf of acquiring company.

Tax Controversy

  • Represented national shipping company in connection with its classification of workers as contractors, resulting in full concession by IRS while still in the audit phase.
  • Represented major financial institutions in litigation and trials related to the validity of hundreds of millions of dollars in claimed foreign tax credits.
  • Represented national retailer before IRS Appeals in connection with the validity of loss deductions from sales of stores, resulting in settlement of the dispute prior to litigation.
  • Represented multinational technology and pharmaceutical companies in responses to congressional inquiries concerning international tax matters, and prepared executives for potential testimony.
  • Member of team that tried estate tax case in U.S. Tax Court, resulting in complete victory for the taxpayer.
  • Represented substantial charity in IRS audit related to possible excess benefit transactions, resulting in no liability at the conclusion of the audit.
  • Represented individual before IRS to resolve tax debts.


  • Investigated, indicted, and tried home improvement contractor who had committed bankruptcy, welfare, and contracting fraud.
  • Investigated and indicted former employee of multinational investment bank on wire fraud, identity theft, tax evasion, and money laundering charges.
  • Investigated and charged collision center manager who conspired with a U.S. Department of State employee to misappropriate government vehicles.
  • Investigated and indicted substantial international money-laundering case.
  • Investigated substantial data breach involving government website, which led to nearly $40 million in false tax returns; investigation resulted in money-laundering prosecutions in multiple districts.
  • Investigated and charged former high-ranking D.C. government official with subscribing a false tax return.
  • Investigated and charged false bomb and hostage-crisis threats called into the D.C. 911 system; identified perpetrator despite his use of deactivated phones and spoofed numbers.
  • Investigated and indicted congressional chief of staff on false statement charges.

Other Notable Experience

  • Opinion writer published by USA Today and The Hill.
  • Commentator featured in articles published by Vanity Fair, CNBC and the New York Times.

Professional Experience

  • United States Attorney’s Office, Assistant U.S. Attorney, Fraud and Public Corruption Section, Washington, D.C., January 2013 to April 2018


  • Distinguished Service Award, given by Special Agent in Charge, FBI and Inspector in Charge, USPIS
  • Special Achievement Award, given by U.S. Attorney
  • Recipient of West Outstanding Scholastic Achievement Award and Kerr Memorial Prize, 2004
  • Editor, Cornell Law Review
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Bar Admissions

  • District of Columbia
  • New York

Court Admissions

  • U.S. District Court for the District of Columbia
  • U.S. Tax Court