Jonathan R. Marx Counsel

Jonathan is an experienced trial lawyer with a broad practice representing companies and individuals under scrutiny by prosecutors and regulators. He finds it particularly satisfying to help individual clients navigate a government investigation and see them safely through to the other side.

Jonathan has represented clients under scrutiny by the U.S. Department of Justice for alleged tax fraud, antitrust violations, and abuse of public office.  He has also defended against investigations and civil enforcement actions from the SEC, FCC, and state attorneys general, among others.   He has assisted corporate clients with internal investigations into money laundering, facilitating corruption, and billing fraud by competitors.

Jonathan also maintains an active civil litigation practice.  For example, he has defended an investment bank in fiduciary litigation, an energy industry client in property tax litigation, and a food-and-beverage industry startup accused of misappropriating its business plan.  He also an active member of the firm’s Appeals and Issues team. He has briefed and orally argued in federal appellate court, and has experience seeking interlocutory review of adverse trial court rulings.

Before joining McGuireWoods, Jonathan was a federal prosecutor at the U.S. Department of Justice, Tax Division. He prosecuted tax fraud and other white collar offenses in federal courts throughout the Southeast. He successfully tried several jury trials (including two month-long cases) involving offshore tax fraud, illegal money service businesses, money laundering, and hundreds of millions of dollars in fraudulent tax refund claims. He also served as a Special Assistant U.S. Attorney in Washington, DC, and tried dozens of misdemeanor bench trials in that capacity.

Prior to joining the Justice Department, Jonathan served as a law clerk to Judge Phyllis Kravitch of the U.S. Court of Appeals for the 11th Circuit and Judge T.S. Ellis, III, of the U.S. District Court for the Eastern District of Virginia.

Jonathan is a graduate of the University of North Carolina and the University of Virginia Law School. In law school he won the Roger and Madeleine Traylor prize for outstanding written work and was an editor of Virginia Law Review.



Investigations and trial litigation

Representing a former banker in criminal tax investigation.

Representing a securities industry executive in securities fraud and bid-rigging investigation.

Representing one of the world’s largest banks in an internal investigation into allegations that the bank facilitated corrupt payments in a Latin American country.

Represented a public company in insider trading investigation by SEC.

Represented a politician in grand jury investigation into alleged misuse of office.

Provide ongoing anti-corruption and government ethics advice to a multinational telecommunications client.

Defended a food industry startup against litigation charging it with misappropriating its business plan.

Represent broker-dealer in breach of fiduciary duty litigation involving tax-exempt municipal finance.

Advised a telecommunications company in an internal investigation into unauthorized network bypass and billing fraud by competitor.

Advised a commercial bank in an investigation by the state attorney general into residential foreclosure practices.

Representation of a prominent non-profit executive in a multi-jurisdictional investigation related to allegations of corruption while in office.

Defense of a telecommunications company against proposed FCC penalty.


Briefed and argued appeals of tax fraud and money laundering convictions as a federal prosecutor.

Briefed motion for discretionary interlocutory appeal in wage and hour class action.

Briefed appeal of adverse ruling on corporate veil-piercing issues.

Authored academic amicus brief in U.S. Supreme Court in prisoner litigation case.

As a prosecutor:

Successfully tried a month long jury case involving $100+ million tax refund fraud scheme.

Successfully tried a month long jury trial involving nationwide conspiracy to promote offshore tax fraud and money laundering in Caribbean jurisdictions.

  • University of Virginia School of Law, JD, Order of the Coif, Editorial Board, Virginia Law Review, 2006
  • The University of North Carolina at Chapel Hill, BA, with Honors and Highest Distinction, Phi Beta Kappa, 2003
  • North Carolina
  • U.S. Court of Appeals for the 4th Circuit
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