First Assistant United States Attorney
Phil Selden serves as the First Assistant United States Attorney for the United States Attorney’s Office for the District of Maryland. In this role, Mr. Selden helps manage the investigation and litigation of all criminal and civil cases brought on behalf of the United States.
Mr. Selden began his career as an Assistant United States Attorney in 2010. He has investigated and prosecuted a wide variety of cases, including public corruption, white collar, national security, cybercrime, and violent crime matters. Those matters include corrupt public and elected officials, fraud by corporate entities and senior executives, the theft of intellectual property, international firearms trafficking, export controls violations, threats to elected officials, attacks on members of law enforcement, terrorism financing, money laundering, organized crime, racketeering, human trafficking, and obstruction of justice.
His work has been recognized by the Social Security Administration, the Bureau of Alcohol, Tobacco, Firearms and Explosives, and with multiple Department of Justice Special Achievement Awards. Mr. Selden has also previously received an award for Outstanding Contribution to a Law Enforcement Initiative. In 2020 he was named the Homeland Security Investigations Prosecutor of the Year for his efforts in prosecuting domestic and international corruption.
Before joining the Department of Justice, Mr. Selden worked at the law firm of Arnold & Porter where he handled complex commercial litigation and white collar matters on behalf of Fortune 500 companies. He began his career working with at-risk youth at the Philadelphia Family Court where he was awarded an Outstanding Achievement Award for efforts to reduce rates of juvenile recidivism.
Mr. Selden received his undergraduate degree from Georgetown University, magna cum laude, in the Government Department’s Honors Program. He also was a member of the Georgetown Track and Field Team. Mr. Selden received his Master’s Degree in Government Administration from the University of Pennsylvania and his Juris Doctor degree from Columbia Law School, where he was a Harlan Fiske Stone Scholar, a Tony Patiño Fellow, and a Paula Jewell Fellow. Mr. Selden has taught as an adjunct faculty member at University of Maryland School of Law, Howard University School of Law, Harvard Law School, and the George Washington University Law School.
Ayn B. Ducao
Executive Assistant United States Attorney
Ayn B. Ducao serves as the Executive Assistant United States Attorney for the United States Attorney’s Office for the District of Maryland. Ms. Ducao manages the Administrative Officer and her portfolio also includes subject matter areas such as community reentry efforts, outreach, office safety protocols and the training of new support and administration personal.
During her tenure as a federal prosecutor, Ms. Ducao has served in the Office’s Narcotics and Major Crimes Sections and as the Office’s Human Trafficking Coordinator as well as the Chair of the Maryland Human Trafficking Task Force.
She has investigated and prosecuted a wide variety of criminal matters, including, but not limited to, narcotics conspiracy, racketeering conspiracy, identity theft, child exploitation and human trafficking. Ms. Ducao was part of a prosecution team that won the Attorney General’s Distinguished Service Award for their work on the Baltimore City Detention Center/Black Guerrilla Family prison corruption case. Ms. Ducao was awarded a Maryland Governor’s Citation for her work in combatting human trafficking and has been recognized by the Office for Outstanding Contribution to a Law Enforcement Initiative for her anti-human trafficking work.
Prior to joining the Office, Ms. Ducao clerked for the Honorable Frank C. Damrell, Jr. in the United States District Court for the Eastern District of California and was an associate with a national law firm where she worked on complex litigation matters. She also worked for four years as an Assistant District Attorney in the New York County, New York District Attorney’s Office. She received her Bachelor of Arts and Bachelor of Science from the University of Maryland, College Park and her Juris Doctor degree from Harvard Law School, where she was an Editor on the Harvard Civil Rights-Civil Liberties Law Review.
Stephen M. Schenning
Senior Counsel to the United States Attorney
Stephen M. Schenning serves as the Senior Counsel to the United States Attorney for the United States Attorney’s Office for the District of Maryland. In that role, Mr. Schenning draws on his 29 years of experience serving on behalf of the Office. He has twice served as the Acting United States Attorney and First Assistant United States Attorney for the United States Attorney's Office for the District of Maryland. Mr. Schenning has also served as the Office’s Professional Responsibility Officer, Coordinator for Civil Rights Investigations and Senior Litigation Counsel responsible for training new prosecutors and overseeing curriculum.
As Senior Counsel to the United States Attorney, Mr. Schenning is also the designated Giglio Officer, actively participates in the Office’s indictment case reviews, death penalty reviews, Assistant United States Attorney case reviews and he also co-chairs the Office’s Hiring Committee. During his tenure with the Office, Mr. Schenning has prosecuted a variety of cases including, but not limited to, fraud and public corruption as well as civil rights crimes.
Prior to joining the Office, Mr. Schenning served as an Assistant States Attorney in the Baltimore County, Maryland State’s Attorney’s Office and an Assistant Attorney General at the Maryland Attorney General’s Office. While an Assistant Attorney General Mr. Schenning served as Director and Chief Counsel of the Medicaid Fraud Control Unit. He was also a principal in a private law firm where he was engaged in both complex civil and criminal litigation.
Mr. Schenning received his undergraduate degree from Loyola College and his Juris Doctor, degree with Honors, from the University of Maryland School of Law, where he was the Notes and Comments Editor for the Maryland Law Review. Mr. Schenning also served honorably in United States Army, Military Police Corps. He has also taught as an adjunct faculty member in the graduate division of Stevenson University.