Using Who or Whom

A relative pronoun introduces a relative (or dependent) clause in the sentence.
 

The relative pronouns who and whom give information about people.
 

To find out whether to use who or whom in a sentence, rewrite the dependent clause with a personal pronoun. If the clause uses a subject pronoun (he, she, or they), use who. If the clause uses an object pronoun (him, her, or them), use whom.