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With three decades of experience as a prosecutor, Gregg counsels businesses and individuals in connection with a range of criminal, civil and regulatory matters, including government investigations, internal investigations, litigation, export control, sanctions, trade secrets and regulatory compliance.

Gregg’s extensive background in criminal and national security law, combined with his understanding of government practices and operations, allow him to pinpoint the risks and opportunities that arise in investigatory settings, to put together efficient and effective teams of legal professionals, and to mount a vigorous defense when necessary. Gregg has a strong track record as an accomplished trial lawyer, particularly in complex, high-profile jury trials.

Prior to entering private practice, Gregg served as the United States Attorney for the Western District of Texas—one of the largest and busiest United States Attorney’s Offices in the country—where he supervised more than 300 employees handling a diverse caseload, including matters involving complex white-collar crime, contract fraud, national security, cyber crimes, public corruption, money laundering, export violations, trade secrets, tax, large-scale drug and human trafficking, immigration, child exploitation and violent crime. Gregg has also served as Counselor to the Attorney General of the United States, where he handled both criminal and national security matters, as well as crisis response. He was an Assistant United States Attorney in the U.S. Attorney’s Office for the Western District of Texas for 14 years, where he developed a reputation as an aggressive litigator and indefatigable investigator while building an impressive record handling national security, fraud, violent crime and corruption cases. Before that, he served in various roles in both the Criminal and National Security Divisions of the Department of Justice in Washington, DC. Gregg was a state prosecutor as well, handling murder, gang and other complex cases in New York County for nearly 11 years.

Throughout his career, Gregg has worked closely with the Federal Bureau of Investigation, Internal Revenue Service, Department of Commerce and other federal law enforcement and intelligence agencies. He led task forces in the Department of Justice and spearheaded the Department’s effort to improve its electronic litigation capabilities, focusing heavily on discovery. Gregg understands criminal law, national security law, the justice system, government investigations and the discovery process inside and out. His extensive and varied background means that he can provide clients with realistic and accurate expectations of how a government investigation or prosecution will proceed and where challenges may arise.




  • National Association of Former U.S. Attorneys Exceptional Service Award, 2019
  • Executive Office for U.S. Attorneys (EOUSA) Director’s Award for Superior Performance as an Assistant U.S. Attorney, 2016
  • IRS Director’s Award, 2013
  • FBI Special Recognition Awards, 2009 and 2013
  • Assistant Attorney General Special Commendation Award, 2006


  • J.D., New York University School of Law
    • cum laude
  • B.A., Rutgers University
    • magna cum laude


  • New York

Not admitted in the District of Columbia; practice limited pursuant to D.C. App. R. 49(c)(8), with supervision by Scott Glabe, member of the D.C. Bar.

  • Led large teams of federal agents from multiple agencies, often handling complex financial investigations.
  • Successfully tried complex, serious and high-profile cases in Texas, New York, Missouri and Ohio.
  • Advocated for victims of international terrorism and worked extensively with international partners to prosecute terrorists inside and outside the United States.
  • Supervised large-scale defense fraud cases and complex trade secret cases. Prosecuted numerous significant export violations, including cases involving military equipment and dual-use commodities, as well as cases involving embargoed countries.
  • Prosecuted multiple public officials, including a police chief and other law enforcement officers.
  • Prosecuted Austin, Texas's first bitcoin money laundering case.
  • Prosecuted and tried the assailant in the assassination attempt on a Texas state judge, a case featured on 48 Hours and American Greed.
  • Prosecuted and tried defendants in U.S. v. Mohammed Amawi, hailed as U.S.'s first homegrown terrorism case.
  • Prosecuted and tried terrorism case in Waco, Texas, in which defendant was hours away from detonating bomb near Fort Hood.
Outside the Office

Gregg is an avid outdoorsman and enjoys hiking, hunting and fishing.

Gregg hunts wild hogs in the Texas Hill Country, helping to control a population that presents a significant threat to the environment.

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