Mark J. Biros - Proskauer Rose LLP

Mark J. Biros

Listed in Best Lawyers since 2009
Phone: 202-416-5804

Mark J. Biros, a partner in the Washington, DC office, co-founded the Corporate Defense & Investigations Group. He has over 35 years of investigative and trial experience as a legislative counsel, former prosecutor and as defense counsel, his current role.

On the federal level, Mark served as an Assistant U.S. Attorney for the District of Columbia from 1977 through 1988 and has tried over 100 jury trials. He also served as Deputy Chief of the Felony Trial Division. As a member of the Special Prosecutions Unit, Mark concentrated on complex federal criminal investigations. His investigative experience began as an Assistant Counsel to the U.S. Senate Committee on Presidential Campaign Activities, known informally as the "Watergate Committee." His international practice has taken him to the United Kingdom, Germany, Italy, Belgium, Ireland, Mexico and Argentina, while focusing upon activities in Europe, the Middle East, South America, the Far East and Africa.

On the state level, he investigated and prosecuted political and police corruption in Philadelphia, Pennsylvania, where he was an Assistant Attorney General for several years.

In private practice, Mark has conducted internal investigations in defense of government allegations of violations of the Foreign Corrupt Practices Act, domestic and foreign tax laws, money laundering provisions, bribery, insider trading, anti-trust laws, and government contract fraud, as well as U.S. Customs and environmental law violations. He has helped clients identify internal control issues and establish procedures for compliance under Sarbanes-Oxley, SEC and other regulatory provisions, and has represented organizations and individuals that were the subject of congressional inquiries.

An adjunct Professor at Georgetown University Law Center for over 25 years, Mark presently teaches Advanced Criminal Procedure. He has lectured on criminal law issues at the Federal Judicial Center, where the attendees were federal judges, and to Bar Associations and meetings of private and government attorneys. Further, he provides the Firm’s clients with training on how to conduct internal corporate investigations. In June 2008, Mark addressed the International Bar Association’s 11th Transnational Crime Conference in London about investigations of, and prosecutions for, violations of U.S. economic sanctions. He also addressed the International Bar Association’s Annual meeting in October 2008 in Buenos Aires where he spoke on Minimizing the Impact of Corruption on the Rule of Law & International Business - Detecting, Investigating & Responding to Corrupt Conduct. At the 12th Transnational Crime Conference in June 2009, Mark gave a presentation on how to respond to, and manage, a coordinated multi-national law enforcement investigation.

Mark is a contributing author to two books: Corporate Counsel's Guide to Handling Government Investigations, and Business & Legal Guide to Online Internet Law. Additionally, he has written numerous articles for a variety of publications, including in-depth articles on internal investigations and white collar crime, which have appeared in the National Law Journal, Legal Times and Metropolitan Corporate Counsel publications.

Office Location

1001 Pennsylvania Avenue, NW, Suite 600 South
Washington, DC 20004-2533
United States

Practice Areas

Criminal Defense: White-Collar (Economic Sanctions, Embargoes, Federal, Fraud, Government Investigations, Internal Investigations, Litigation, SEC Enforcement, State)

Other Information

Gender: Male