also: エクスパート
noun
A loanword from English, used to refer to a person with specialized knowledge or skill in a particular field. Often used in professional or technical contexts.
彼はコンピューターセキュリティのエキスパートだ。
He is an expert in computer security.
その問題についてはエキスパートの意見を
You should ask an expert's opinion on that issue.