The Collaborative International Dictionary of English v.0.48:

Innovator \In"no*va`tor\, n. [Cf. F. innovateur.]
   One who innovates. --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

innovator
    n 1: someone who helps to open up a new line of research or
         technology or art [syn: pioneer, innovator,
         trailblazer, groundbreaker]