Mark Biros

Proskauer Rose LLP

Mark J. Biros, a partner, co-founded the White Collar 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 35 years, Mark 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. 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 American Criminal Law Review, National Law Journal, Legal Times and Metropolitan Corporate Counsel publications.

Education :

  • Georgetown University Law Center, J.D., 1973
  • Princeton University, B.A., 1970

Admissions & Qualifications : District of Columbia

Court Admissions :

  • U.S. Court of Appeals, Fourth Circuit
  • U.S. Court of Appeals, District of Columbia Circuit
  • U.S. District Court, District of Columbia
  • U.S. District Court, Maryland

Memberships :

  • American Bar Association (Sections on Litigation and Criminal Law)
  • The Metropolitan Corporate Counsel (Law Firm Advisory Committee)
  • International Bar Association (Co-Chair, Criminal Law Committee)

Government Service :

  • Deputy Chief, Felony Trial Division, U.S. Attorney’s Office, Washington, DC, 1984-1985
  • Assistant U.S. Attorney, District of Columbia, 1977-1988
  • Assistant Attorney General, Commonwealth of Pennsylvania, 1975-1977


Rate : $$$

What types of cases Attorney Mark Biros & Proskauer Rose LLP can handle?
Proskauer Rose LLP can handle cases related to laws concerning Corporate, Litigation, White Collar Crime. We manually verify each attorney’s practice areas before approving their profiles and reviews on our website.
Where is Proskauer Rose LLP located?
Proskauer Rose LLP is located at 1001 Pennsylvania Ave NW #600, Washington, DC 20004, USA. You can reach out to Proskauer Rose LLP using their phone line 202.416.5804. You can also check their website or email them at [email protected].
How much would it cost to hire Proskauer Rose LLP?
Mark Biros lawyer charges are specific to each case. However, they work with contingency fees and its ranges from $$ to $$$. They also provide free consultation [and no obligation quotes] if you are interested to hire.
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