Mark Holden
Prowl Investigations LLC, Owner
My law enforcement career began at 14 in the Baltimore City Police Explorer Program, followed by a role as a Baltimore City Police Cadet. I then enlisted in the U.S. Coast Guard, executing high-risk Search and Rescue and Interdiction missions before receiving an Honorable Discharge.Following military service, I handled federal law enforcement for the DoD Army Police at Aberdeen Proving Grounds. In 2006, I joined the U.S. Secret Service Uniformed Division, protecting the White House Complex and serving in the West Wing under Presidents Bush and Obama.In 2011, I joined the Greenbelt City Police Department, rising to Master Patrol Officer. As a Criminal Investigator (2014–2022), I investigated major crimes, achieving a 62% case closure rate. I also led the Homeland Security Unit, served on the SAT Street Crimes Unit, partnered with federal task forces (HIDTA, USMS), and managed background investigations.