sentences:  John W. Marshall
  
  John William Marshall (born July 6, 1958) served as Secretary of Public Safety in the Cabinet of Virginia Governor Tim Kaine from 2006 to 2010, and Governor Mark Warner from 2002 to 2006, and was the longest-serving member of the Virginia Governor's Cabinet.Prior to becoming Virginia Secretary of Public Safety in January, 2002, he served in the Virginia State Police, an agency under the jurisdiction of the Virginia Secretary of Public Safety, from 1980 to 1994, where he was assigned as a State Trooper, Narcotics Division Special Agent, Training Academy Instructor, and Field Operations Sergeant.