Director of the United States Marshals Service
The director of the United States Marshals Service, abbreviated USMS director, is the head of the United States Marshals Service (USMS). The director oversees and manages the operations of the Marshals Service and directly superintends the various United States Marshals, which lead all USMS personnel within their respective federal judicial district.
Source: Wikipedia — Director of the United States Marshals Service (CC BY-SA 4.0)