Professional Qualifications
Mr. Rosen is an exceptional trial attorney and has extensive experience working with federal law enforcement agencies and government prosecutors, which allows him to analyze investigations and indictments from all perspectives. While in government service, he developed training programs and procedures for criminal prosecution, providing him with unique insight into the decisions, risks, and challenges associated with any investigation.
Over the course of his distinguished government career, Mr. Rosen developed a reputation as a battle-tested trial lawyer and trusted leader in managing complex, high-stakes investigations. As a former chief within the U.S. Attorney’s Office for the District of Columbia, Mr. Rosen was entrusted with supervising more than 1000 prosecutions connected with the January 6, 2021 breach and attack of the U.S. Capitol, the largest federal prosecution in American history. He trained and managed more than 200 prosecutors and oversaw every step, including the initial investigation, grand jury practice, motions practice, trial preparation and execution and sentencing, along with post-sentencing appeals, including to the D.C. Circuit and U.S. Supreme Court.
Mr. Rosen has managed and tried fraud and embezzlement cases as well as those involving complex violent crimes, conspiracies, kidnappings, narcotics trafficking and murder. At RJO, he represents clients in criminal and regulatory matters involving the False Claims Act, particularly in the field of government contracts, procurement and federal fund recipient fraud. He also handles high-stakes financial and regulatory investigations, among other matters.
From 2011 to 2015, Mr. Rosen served as an Assistant Commonwealth’s Attorney in Loudoun County, Virginia, helping to prosecute all crimes, ranging from traffic offenses to murder.
Before law school, Mr. Rosen worked as an employee for the U.S. Intelligence Community.
Mr. Rosen currently serves as an adjunct professor at the George Washington University Law School, where he teaches Trial Advocacy (3-credit experiential learning course) and Role of a Federal Prosecutor (2-credit seminar).
Representative Matters
- Co-drafted and filed an amici curiae brief on behalf of more than 100 former senior Department of Justice officials in United States v. Comey (E.D. Va.), addressing the constitutional limits on vindictive and selective prosecution
- Defeated all 65 counts in an administrative embezzlement and conflict of interest proceeding brought against a nonprofit organization by the City and County of San Francisco
- Sued the Department of the Army in the Eastern District of Virginia for misapplying its own regulations governing reimbursement of overseas victims under the Foreign Claims Act
- Defended clients in procurement fraud investigations and prosecutions
- Defended a client charged with immigration fraud and theft of government funds
- Defended an individual charged with federal tax evasion and conspiracy to defraud the United States
- Defended individuals charged with defrauding retail investors through cryptocurrency schemes
- Defended individuals accused of unlawfully retaining and disclosing national defense information
- Represented law enforcement whistleblowers in matters implicating national security
- Counseled a company through a DEA investigation
- Represented clients in investigations and enforcement proceedings before the Securities and Exchange Commission
- Defended a healthcare company in a putative federal class action arising from a data breach
- Defended a health information exchange in civil litigation in D.C. Superior Court
- Led an internal fraud investigation for a nonprofit and coordinated the findings with law enforcement
- Guided a nonprofit through a regulatory inquiry by the State of California
- Prepared and represented witnesses in federal and state investigations in Washington, California, and New York (cases ranging from antitrust bid rigging, money laundering, environmental criminal offenses, to wire fraud conspiracy)
- Represented a complainant through a university Title IX investigation and hearing
- Pursued recovery from a national bank on behalf of company victim of a fraud scheme
Professional Recognition
- 2024 Director’s Award from the Executive Office of U.S. Attorneys for his superior performance as a supervisor (one of only three bestowed nationally)
- 2023 U.S. Attorney’s Award for Excellence in Management
- U.S. Attorney Team Award
- Multiple Special Act awards for his trials and litigation success
- Exceptional Service Award from the National Association of Former U.S. Attorneys
- Anti-Defamation League’s Shield Award for law enforcement officers and officials who promote justice
Education
J.D., The George Washington University Law School (magna cum laude)
- Dean’s Fellow
- Member, Public Contracts Law Journal
- Research Assistant (International Money Laundering)
- President, National Security Law Association
B.A., The George Washington University, With Honors (summa cum laude)
- History Degree – American Civil War Thesis Focus
- Phi Beta Kappa Honors Society
Bar Admissions
Virginia
District of Columbia
Court Admissions
U.S. District Court, District of Columbia
U.S. District Court, Maryland
U.S. District Court, Eastern District of Virginia
Commonwealth of Virginia
D.C. Superior Court