(be) a guru in (one's) field

Translations
(быть) гуру в (чьей-то) области
She is considered a guru in the fashion industry.
Ее считают гуру в индустрии моды.
Definitions
To be a guru in one's field means to be highly knowledgeable, skilled, and respected as an expert or authority in a particular area of work, study, or interest.