The phrase "an expertise at" is not correct in standard English; the correct form is "expertise in." You can use "expertise in" when referring to someone's specialized knowledge or skill in a particular area or field.
Example: "She has an expertise in data analysis that greatly benefits our team."
Alternatives: "a proficiency in" or "a specialization in".
There is an expertise at City and scale of ambition that Guardiola must find attractive.
"Guy brings an energy and an expertise at physicality and action while being faithful to the period," Mr. Law said.
But he didn't get where he was today without developing an expertise at ferreting out pieces of information people didn't really want him to know.
Friends, jokers, rescuers, acrobats, athletes, fighters, biters, workers, slackers, hustlers, entertainers and guardians, dogs have developed over the years an uncanny ability to seize photo opportunities and an expertise at hogging the camera to upstage their human companions.
"The partnership will create new opportunities for the future of the Dieppe plant and the development of an expertise at the core of its historic role," he said.
"In China, the game companies have been able to focus on online games for quite a long time, and they've developed an expertise at it".
Barton had the born caricaturist's abnormal sensitivity to facial configuration, and a casual expertise at tellingly finding his way among the interlocking bumps and creases of physiognomy.
Human beings have developed through social experience a natural expertise at extracting information from faces (identity, race, gender, age, emotional state, etc)., with the exception of other-race/ethnic group face recognition [15]; a well-known phenomenon often reported in the literature as the other-race effect [16].
It's all about living 100% in the moment, and when music does that with a level of expertise, at a level of technical competence, that's really what it is.
If you ask people about politics, or history, or the weather, most people will possess at least a modicum of expertise, at least along a narrow band.
The World Health Organization decided in November to end its designation of Zika virus as a public health emergency, but that doesn't mean that Zika virus has disappeared, explained Dr. Carlos Pardo-Villamizar, a clinical neurologist with an expertise in infectious disorders at Johns Hopkins Medicine.
