Office Leadership

Troy Rivetti is currently leading the office as First Assistant United States Attorney for the Western District of Pennsylvania, by delegation.  Mr. Rivetti previously held the position of Acting United States Attorney from February 2023 to June 2023, and again from January 2025 to November 2025.  

Mr. Rivetti’s career in the Department of Justice has spanned more than 25 years.  Prior to his most recent leadership roles, Mr. Rivetti held a series of positions in the U.S. Attorney’s Office, including serving as the First Assistant U.S. Attorney from June 2023 to January 2025, and from November 2021 to February 2023.  He also served as the Chief of the Criminal Division from 2019 to 2021.  Mr. Rivetti joined the U.S. Attorney’s Office in 1997.  Throughout his career as a federal prosecutor, Mr. Rivetti’s primary area of concentration has involved the investigation and prosecution of violent crime, including large-scale drug trafficking organizations and firearms offenses.  Of particular note, Mr. Rivetti co-lead the multi-year investigation and prosecution of United States v. Robert Bowers, the perpetrator of the worst antisemitic mass shooting in U.S. history.  He served as first chair for the trial team throughout the three-month capital jury selection, trial and sentencing.  

Mr. Rivetti obtained his Bachelor of Arts degree from Dickenson College and his Juris Doctor from Georgetown University.  Following graduation from law school, Mr. Rivetti was employed for five years as a litigation associate at a large Pittsburgh law firm.  He then served as a law clerk for two years for the Honorable D. Brooks Smith.

Carolyn J. Bloch joined the office in 1989.  In her 35 years as a federal prosecutor, Ms. Bloch has handled an extensive variety of violent crimes, narcotics, child exploitation, and white collar cases.  Ms. Bloch serves as the Coordinator for the BRIDGES Presentence Court program in the Western District of Pennsylvania, providing for intensive presentence supervision and alternatives to imprisonment.

In 2015, Ms. Bloch was one of a dozen federal prosecutors from across the country selected to serve with the U.S. Pardon Attorney on President Obama’s commutation project.  She has also served as the Coordinator for the Project Safe Child initiative, as well as initiatives focused on the reduction of violent gun crime and financial crimes committed against the elderly.  Ms. Bloch is a graduate of Chatham University and the University of Pittsburgh School of Law. 

Jerome A. Moschetta joined the office in 2018 as an Assistant U.S. Attorney in the Organized Crime and Narcotics Section with an emphasis on Organized Crime Drug Enforcement Task Force (OCDETF) investigations targeting neighborhood-based street gangs and drug trafficking organizations, often through long-term Title III wiretap investigations. 

From 2008 to 2018, Mr. Moschetta served as a supervisory Deputy District Attorney and Assistant District Attorney with the Washington County (PA) District Attorney’s Office, where he served as a trial attorney prosecuting various felony and misdemeanor offenses including homicide, drug trafficking, and other violent crimes.  Mr. Moschetta also represented the Washington County District Attorney’s Office before the Pennsylvania appellate courts and in post-conviction litigation in both state and federal court. 

From 2015 through 2018, during the height of the opioid epidemic, Mr. Moschetta served as a Special Assistant U.S. Attorney, emphasizing on drug trafficking and opioid overdose death investigations arising out of Washington County, Pennsylvania.  Mr. Moschetta is a graduate of John Carroll University and Western Michigan University Cooley School of Law.

Doug Maloney is a graduate of Allegheny College and the Temple University School of Law.  Following graduation from law school in 2012, Mr. Maloney served as a law clerk for the late Honorable Franklin S. Van Antwerpen on the U.S. Court of Appeals for the Third Circuit.  In 2013, Mr. Maloney joined the Allegheny County District Attorney’s office as an Assistant District Attorney.  During his time as an Assistant District Attorney, Mr. Maloney prosecuted a variety of cases, ranging from DUIs and misdemeanor offenses, to armed robberies, shootings, homicides, and other serious felonies.  In 2019, Mr. Maloney joined the U.S. Attorney’s Office in the Western District of Pennsylvania, and has worked in the Violent Crimes Section, primarily prosecuting violations of laws related to narcotics, firearms, and violent crimes. 

Jeffrey R. Bengel joined the office in 2018 as an Assistant United States Attorney in the Criminal Division.  As a member of the Economic, Cyber, and National Security Crimes Section, Mr. Bengel has handled a variety of cases involving fraud, money laundering, identity theft, public corruption, threats, and child exploitation.  He has also served as the office’s Pandemic Fraud Coordinator, Elder Fraud Coordinator, Digital Asset Coordinator, and District Election Officer.  

Prior to joining the United States Attorney’s Office, Mr. Bengel was an associate at a large law firm and a law clerk to the Honorable John D. Bates of the United States District Court for the District of Columbia.  He is a graduate of Harvard College and the New York University School of Law.  

Lee J. Karl is the Chief of the Civil Division.

Mr. Karl joined the office in 2004 as an Assistant U.S. Attorney in the civil division where he defended the United States, its agencies and employees in a wide range of civil lawsuits. In 2010, he transferred to the Economic Crimes Section of the Criminal Division, where he prosecuted a  variety of crimes, including frauds schemes, embezzlements, public corruption, tax violations and child exploitation. In 2018, he became the Deputy Chief of the Economic Crimes Section and assisted with supervising the section.

Mr. Karl has held other positions within the office, including Ethics Officer, Asset Forfeiture Coordinator, Financial Litigation Coordinator and District Election Officer. Prior to joining the Office, Mr. Karl spent two years as a Litigation Associate at a large Pittsburgh law firm and spent one year as a Federal Judicial Law Clerk for the Hon. Ronald Buckwalter in the Eastern District of Pennsylvania. He is a graduate of Ohio University and the University of Pittsburgh School of Law.

 Mr. Fischer serves as the Deputy Chief of the Civil Division, as well as the Civil Division’s Healthcare Fraud and Civil Rights Coordinator.  In those roles, Mr. Fischer represents the United States in both defensive and affirmative civil litigation, including in cases brought under the False Claims Act, Controlled Substances Act, and Americans with Disabilities Act.  

Prior to joining the U.S. Attorney’s Office in 2018, Mr. Fischer practiced complex commercial litigation at a pair of large law firms.  Mr. Fischer is a native Pittsburgher, who graduated from Central Catholic, and then received his undergraduate and law degrees from the University of Notre Dame.

Laura S. Irwin is the Chief of the Appellate Division.

Ms. Irwin is a 1991 graduate of the University of Pittsburgh School of Law. Following her graduation from law school, she served as a law clerk to the Hon. William W. Wilkins, Jr. on the U.S. Court of Appeals for the Fourth Circuit. After several years in private practice in Pittsburgh following her clerkship, Ms. Irwin joined the U.S. Attorney’s Office in 2000 as a member of the Civil Division. She transferred to the Appellate Division in 2004. In September 2018, she was named the Chief of the Appellate Division.

Matthew S. McHale is Deputy Chief of the Appellate Division. He also serves as a Professional Responsibility Officer, advising on matters relating to rules of professional conduct. Mr. McHale joined the Office in 2019. Before that, Mr. McHale served for five years in the City of Pittsburgh Law Department, where he joined and then led the federal practice group. Mr. McHale has also worked in private practice. Mr. McHale clerked for the Hon. Kermit V. Lipez of the U.S. Court of Appeals for the First Circuit. Mr. McHale is a graduate of Harvard College and Yale Law School.

Adam M. Stahl is the Administrative Officer.

Mr. Stahl joined the United States Attorney’s Office for the Western District of Pennsylvania in December 2007 in the Human Resources section of the Administrative Division.  In 2010, Mr. Stahl transferred into the Administrative Division’s Information Technology section.

Mr. Stahl graduated from the University of Pittsburgh in 2011 with a Bachelor of Science in Information Science.  Upon graduation, he became an Information Technology Specialist.  In 2014, Mr. Stahl received FEB Pittsburgh’s Bronze Award for Outstanding Technical Employee.

Mr. Stahl became the district’s Supervisory Information Technology Specialist in October of 2016.  In 2020, Mr. Stahl received FEB Pittsburgh’s Gold Award for Outstanding Supervisor in an Administrative Series. 

In June of 2023, Mr. Stahl became the district’s Administrative Officer.