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.