Source : Webster's Revised Unabridged Dictionary (1913)

Systematizer \Sys"tem*a*ti`zer\, n.
   One who systematizes.

         Aristotle may be called the systematizer of his
         master's doctrines.                      --Harris.

Source : WordNet®

systematizer
     n : an organizer who puts things in order; "Aristotle was a
         great orderer of ideas" [syn: {orderer}, {systematiser},
         {systemizer}, {systemiser}, {systematist}]