Is it ... To who? Or it ... To whom?
It could be either, depending on the role of the pronoun in the sentence. Here are all the cases for the pronouns "who / whom": (1) "Whom Who wrote that book?" (subject: nominative only) (2) "Whom / who did Ed meet in town?" (object of verb: accusative or nominative) (3) "To whom / who is he talking?" (object of fronted prep: accusative only) (4) "Whom / who is he talking to?" (object of stranded prep: accusative or nominative) (5) "Who / whom is he?" (predicative complement: nominative only) Notes: - when it is object of the verb, as in (2), both cases are found, but "whom" is formal; "who" is preferred in conversational English by most people. - when the preposition is stranded, as in (4), "who" is strongly favoured. PaulM