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handler

noun

a person or thing that handles; specif.,
  1. ☆ a boxer's trainer and second
  2. a person who trains and manages a horse, dog, etc. in a show or contest
  3. ☆ a person employed to advise a politician, celebrity, etc. on what to say or do so as to shape public opinion and thereby develop a positive public image

See handler in American Heritage Dictionary 4

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