J. Gregory Deis

Chicago,  IL  U.S.A.
Phone312 701 8035

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Experience & Credentials

Practice Areas

  • Congressional Investigations & Crisis Management
  • FCPA/Anti-Corruption and Anti-Bribery
  • Litigation & Dispute Resolution
  • Internal Investigations
  • Securities Litigation & Enforcement
  • White Collar Defense & Compliance
Contact InfoTelephone: 312 701 8035
Fax: 312 276 8471
University Marquette University, B.S., 1997
Law SchoolUniversity of Illinois College of Law, J.D., Valedictorian, summa cum laude 2002
Admitted2003, Illinois

J. Gregory (Greg) Deis is a former federal prosecutor whose practice focuses on complex commercial litigation, internal investigations and white-collar criminal defense. Greg is an experienced trial lawyer, having tried over a dozen criminal and civil cases to verdict, most as first chair. He has also served as lead counsel in numerous criminal and civil appeals.

At the firm, Greg has conducted internal investigations on behalf of a variety of clients. Greg also regularly represents companies and senior executives in criminal and regulatory investigations, including investigations involving the FCPA, health care, tax, money laundering and environmental offenses. Greg's complex commercial litigation experience involves various areas of law, including the False Claims Act, RICO, tax controversy, federal securities law, shareholder derivative claims, trademark law and defamation.

Prior to rejoining Mayer Brown, Greg served as an Assistant US Attorney in Chicago, assigned to the Public Corruption section. Greg prosecuted numerous public officials and law enforcement officers with fraud, bribery, extortion and tax offenses, including the bribery prosecution of an Illinois state representative. His trial experience includes the month-long trial of William Cellini, a long-standing political insider in Illinois convicted of extorting campaign contributions for then Governor Rod Blagojevich. In addition to his corruption experience, Greg investigated and prosecuted a wide range of federal criminal cases involving complex financial fraud, procurement fraud, money laundering, computer offenses and international drug trafficking.

Greg joined the US Attorney's Office after working at the firm from 2003-07. He has been an adjunct professor of criminal procedure and trial advocacy at DePaul University College of Law. Greg began his legal career as a law clerk for the Honorable Deanell Reece Tacha, Chief Judge of the US Court of Appeals for the Tenth Circuit.


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Foreign Bribery Report Issued by OECD
Abigail M. Bartine,J. Gregory Deis,Michael D. Frisch,William Michael, February 26, 2015
The Organisation for Economic Co-operation and Development (OECD) has released its Foreign Bribery Report, which provides a comprehensive analysis of anti-bribery enforcement actions around the world dating from 1999. The report examines enforcement actions taken by all countries that have enacted...

US SEC Brings First Enforcement Action For Market Manipulation Through High-Frequency Trading
J. Gregory Deis,Kathleen M. Przywara,Jerome J. Roche,Matthew A. Rossi, October 28, 2014
Providing another reminder of the US federal government’s ongoing scrutiny of high-frequency trading (“HFT”) firms and manipulative trading practices involving HFT, the Securities and Exchange Commission recently settled its first market-manipulation case against a HFT firm under...

Eleventh Circuit Is First US Appeals Court to Define “Instrumentality” of a Foreign Government Under the Foreign Corrupt Practices Act
Vincent J. Connelly,J. Gregory Deis,Kelly B. Kramer,William Michael,Laurence Urgenson, May 23, 2014
The US Court of Appeals for the Eleventh Circuit has provided useful guidance on the meaning of the term “instrumentality” as used in the Foreign Corrupt Practices Act (“FCPA”). In a landmark decision released on May 16, the court established the criteria for when companies...
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Office Information

J. Gregory Deis

71 S. Wacker Drive
ChicagoIL 60606


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