LEONARDTOWN, MD (June 29, 2026) – State’s Attorney Jaymi Sterling is proud to announce the appointment of Alena Mosier as Deputy State’s Attorney for the St. Mary’s County State’s Attorney’s Office.
Since joining the Office of the State’s Attorney for St. Mary’s County in 2023, Deputy State’s Attorney Alena Mosier has been a founding member of State’s Attorney Jaymi Sterling’s administrative team and has prosecuted some of the office’s most notable violent crime and special victim cases. During her tenure, she served as Chief of Legal Operations and District Court and as a Senior Assistant State’s Attorney. As Deputy State’s Attorney, Mosier will continue to oversee attorney training and administrative policies while maintaining an active caseload in both the District and Circuit Courts.
“Alena has consistently demonstrated exceptional leadership, impeccable trial skills, and an unmatched commitment to justice,” said State’s Attorney Jaymi Sterling. “I am grateful for her dedication and hard work, and I am thrilled she is committed to serving our community in this new role as we continue to work together to protect the citizens of St. Mary’s County.”
Deputy State’s Attorney Mosier previously served as a Special Assistant U.S. Attorney (SAUSA) in the Violent Organized Crime Unit of the U.S. Attorney’s Office for the District of Maryland. She began her prosecutorial career as an Assistant State’s Attorney for the Anne Arundel County State’s Attorney’s Office, where she specialized in the prosecution of violent crimes, domestic violence, sexual assault, and human trafficking cases.
Mosier graduated from Florida State University with a Bachelor of Science in Political Science and Philosophy before earning her Juris Doctor from Wake Forest University School of Law, where she focused on criminal prosecution. Following law school, she served as a law clerk to the Honorable Joan E. Ryon of the Montgomery County Circuit Court.
Deputy State’s Attorney Mosier was acknowledged as the County’s 2026 Law Enforcement Officer/Prosecutor of the Year by the St. Mary’s County Department of Aging & Human Services, the Triad/SALT Council, the Optimist Clubs of St. Mary’s, and the St. Mary’s County State’s Attorney’s Office. Additionally, in 2021, Mosier was honored as the Victoria F. Gelfman Legal Excellence Award winner, an award honoring one rising Maryland Assistant State’s Attorney for prosecutorial excellence.
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