Peter R. Zeidenberg's primary focus is defending individuals and businesses in white-collar criminal matters and related issues involving corporate governance and internal fraud investigations.

His practice includes the representation of business organizations and individuals through counseling, investigation, and criminal defense, including trial.  Peter is experienced in conducting internal investigations and has counseled companies and organizations responding to government enforcement threats, including grand jury investigations, administrative subpoenas, and Congressional investigations. Peter has extensive experience with the Foreign Corrupt Practices Act, criminal anti-trust, government contracting and procurement fraud, OFAC and financial fraud. Peter's clients have included foreign banks and international corporations and individuals accused of fraud, conflict of interest, and insider trading.

Peter is an experienced trial attorney, having first-chaired more than 100 jury trials, and handled two dozen appellate arguments.  Prior to joining DLA Piper in 2007, Peter spent 17 years as a federal prosecutor, both at the US Department of Justice, where he served in both the Public Integrity Section of the Criminal Division and, before that, at the United States Attorney's Office in the District of Columbia. Peter was also a state prosecutor for five years in Middlesex County, Massachusetts.

While at the Department of Justice, Peter investigated and prosecuted local, state and federal officials. His trial experience includes some of the highest profile criminal cases handled by the DOJ. Peter served as a Deputy Special Counsel in the investigation and prosecution of Lewis "Scooter" Libby. Peter gave the government’s closing argument and handled direct examination of half of the government witnesses in the Libby case.

Peter also prosecuted the case of United States v. David Safavian, in which the former Chief of Staff of the General Services Administration was tried for obstruction of justice and false statements in connection with the Jack Abramoff investigation. He also coordinated and supervised investigations conducted by the FBI, CIA, and Office of Inspector Generals from GSA, DOJ, DEA and SIGIR (Special Inspector General for Iraq Reconstruction).