специалист по

specialist in

→ специалист
phrase Rare #49,988
specialist in Used to describe someone who specializes in a particular subject or field. The noun after «по» is usually in the dative case.
RU: Она специалист по истории искусства.
EN: She is a specialist in art history.

Том-специалист по этой теме.

Tom is an expert on this topic.