мастерски владеть искусством(Most telemarketers are skilled in the art of persuasion. Even people who consider themselves savvy are vulnerable, especially aging people.ART Vancouver)
специалист в данной области техники(обобщённая точка зрения при экспертных оценках; an invention shall be considered as involving an inventive step if, having regard to the state of the art, it is not obvious to a person skilled in the art. – WAD)