Greggory Pemberton joined the Metropolitan Police Department in 2005 and worked in patrol and vice in the Third District. In 2008, Pemberton was promoted to detective and moved to the Seventh District where he worked in the Violent Crimes Unit covering the Southeast section of DC. In 2017, Greggory was selected to be the lead detective on a mass arrest of rioters that were arrested during the presidential inauguration and detailed to the US Attorney's Office. After a one-year detail to the Joint Terrorism Task Force at the Federal Bureau of Investigation in 2018, Gregg returned to the Violent Crimes Unit at the Seventh District. In 2020, he successfully ran for the position of Chairman of the DC Police Union. He was re-elected in 2022 and currently serves and represents the 3,000 members of the MPD's rank-and-file.