Alonzo Black's public service to Prince George's County began upon his honorable discharge from United States Marine Corps as a decorated combat sergeant in 1967. As the county's first African American police officer, Alonzo Black attended Prince George's Community College and Bowie State University, graduating cum laude in 1974 with a BS degree in business administration. Later that year, he was appointed detective sergeant for the Prince George's County state's attorney as he started law school at the University of Maryland.
Upon passing the Maryland State Bar in 1977, he practiced as a prosecuting attorney in both the district and circuit courts and coordinated grand jury cases for two years before retiring to civil practice in 1992. Alonzo Black was appointed assistant sheriff in 1993. One year later he was appointed chief assistant sheriff, and served as the agency's second in command until his election as sheriff in 1998.
As sheriff, his priorities included protecting domestic violence victims, enforcing child support orders, and aggressively pursuing closure of the agency's 38,000 outstanding arrest warrants. His other recent initiatives have included an agency reorganization that emphasizes these goals, the formation of a warrant review committee to determine the prosecutorial merit of historical warrants, and dedication of the agency's Specialized Services Team focusing on the service of outstanding arrest warrants.
Alonzo Black is the father of five children. He resides in Fort Washington, MD, with his wife of 30 years, Loretta, and their family.