Manger was born in Baltimore in 1954 or 1955 and is named after both his father and grandfather. When he was 14, his family moved from Baltimore City to Silver Spring, Maryland.[3] Manger has three siblings.[1]
He started his career in law enforcement in January 1977 as an officer with the Fairfax County Police Department. From 1998 to 2004, Manger served as chief of the department.[6]
^ abPolice Executive Research Forum (July 2012). "PERF Welcomes Three New Board Members"(PDF). Subject to Debate: Newsletter of the Police Executive Research Forum. 1120 Connecticut Avenue, NW, Suite 930, Washington, D.C., 20036: Police Executive Research Forum. Archived from the original on January 15, 2014. Retrieved 27 July 2021.{{cite web}}: CS1 maint: location (link)
^ abcMontgomery County Department of Police (2013). "Office of the Chief". myMCPnews. 100 Edison Park Drive, Gaithersburg, Maryland, 20878: Montgomery County. Archived from the original on August 16, 2013. Retrieved 27 July 2021.{{cite web}}: CS1 maint: location (link)