Mary Lou Soller

Member & Firm Counsel,
Miller & Chevalier Chartered

My Contact Information

Miller & Chevalier Chartered
Washington, DC
Work: (202) 626-5849

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Washington DC



Mary Lou Soller concentrates her practice primarily on complex criminal and civil issues and investigations. She focuses on the representation of corporations and individuals in government fraud investigations. She has represented clients in cases involving civil and criminal fraud, False Claims Act (FCA) and Foreign Corrupt Practices Act (FCPA) allegations. In addition, she has extensive experience dealing with all aspects of federal procurement and health care fraud investigative authorities, including auditors, investigators, federal and state prosecutors and civil attorneys
and grand juries, on a wide variety of issues.

Early in her career, Ms. Soller was in private practice in the District of Columbia, focusing on energy litigation. She then joined the District of Columbia Public Defender Service, where she was a Trial Attorney and Director of Training. Ms. Soller also served as the Senior Investigative Counsel of the Special Committee on Investigations of the U.S. Senate.

Ms. Soller has taught in trial advocacy programs, including the National Institute of Trial Advocacy, Continuing Legal Education for the Maryland Bar, the Federal Bar Association and at Harvard Law School. She has also conducted training programs on privilege and professional responsibility for a number of firm clients.


  • Represented defense contractor in FCA case in U.S. District Court in the District of Columbia (motion to dismiss granted and affirmed on appeal).
  • Represented defense contractor in FCA case in E.D. Virginia (case resolved without payment of any damages or fines).
  • Provided advice on attorney-client privilege and work product issues in connection major FCPA cases.


  • Senior Investigative Counsel, Special Committee on Investigations, U.S. Senate 
  • Trial Attorney and Director of Training, Public Defender Service for the District of Columbia


The Best Lawyers in America®: Ethics and Professional Responsibility Law, 2013 - 2020


Current Positions
  • Board Member, Board of Professional Responsibility, District of Columbia Court of Appeals
  • Member, Women White Collar Criminal Defense Lawyers
  • Member, Committee on White Collar Crime, American Bar Association
  • Member, National Association of Criminal Defense Lawyers
  • Member, Procurement Fraud Committee, Section of Public Contract Law, American Bar Association (former Chair)
  • Member, Ethics, Compliance, and Professional Responsibility Committee, Section of Public Contract Law, American Bar Association (former Co-Chair)
  • Board Member, Legal Aid Society of the District of Columbia
Former Positions
  • Vice Chair, District of Columbia Commission on Judicial Disabilities and Tenure 
  • Member, Practitioners' Advisory Group to the United States Sentencing Commission
  • Board of Directors, BNA Criminal Practice Manual
  • Adjunct Professor, Criminal Trial Practice, The Catholic University of America Columbus School of Law
  • Chair, Committee on the Rules of Professional Responsibility, District of Columbia Bar
  • Chair, Hearing Committee, Board of Professional Responsibility, District of Columbia Bar
  • Member, Ethics Committee, District of Columbia Bar
  • Chair, Sentencing Guidelines Committee, Criminal Justice Section, American Bar Association
  • Member, Steering Committee, Criminal Law and Individual Rights Section, District of Columbia Bar

  • District of Columbia
  • Virginia
  • United States Supreme Court
  • District of Columbia Superior Court
  • Supreme Court of Virginia
  • United States Court of Appeals for the District of Columbia Circuit
  • United States Court of Appeals for Virginia
  • United States District Court for the District of Columbia
  • United States District Court for the Eastern District of Virginia

Practice Areas

  • Congressional Investigations
  • Corporate Crime
  • Government Contracting, Bid Protests and the False Claims Act
  • Government Investigations
  • Internal Investigations
  • White Collar Crime