sentences:  Robert Mark
  
  Sir Robert Mark (13 March 1917 – 30 September 2010) was an English police officer who served as Chief Constable of Leicester City Police, and later as Commissioner of the Metropolitan Police from 1972 to 1977.Mark was the first Metropolitan Commissioner to have risen through all the ranks from the lowest to the highest (a route followed by all subsequent Commissioners), although a few predecessors had served as Constables prior to fast-track promotion.