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. Following his resignation as Virginia Secretary of Public Safety in January 2010, he served as a consultant and senior advisor to the Thurgood Marshall College Fund until January 2011, and subsequently became a public speaker on topics including criminal justice and civil rights.