Source : Webster's Revised Unabridged Dictionary (1913)

Systematist \Sys"tem*a*tist\, n. [Cf. F. syst['e]matiste.]
   1. One who forms a system, or reduces to system.

   2. One who adheres to a system.

Source : WordNet®

systematist
     n 1: a biologist who specializes in the classification of
          organisms into groups on the basis of their structure
          and origin and behavior [syn: {taxonomist}, {taxonomer}]
     2: an organizer who puts things in order; "Aristotle was a
        great orderer of ideas" [syn: {orderer}, {systematizer}, {systematiser},
         {systemizer}, {systemiser}]