Source : Webster's Revised Unabridged Dictionary (1913)

Interviewer \In"ter*view`er\, n.
   One who interviews; especially, one who obtains an interview
   with another for the purpose of eliciting his opinions or
   obtaining information for publication.

         It would have made him the prince of interviewers in
         these days.                              --Leslie
                                                  Stephen.

Source : WordNet®

interviewer
     n : a person who conducts an interview