noun
chief officer
A direct loanword from English, used in business or organizational contexts to refer to a high-ranking executive, such as a CEO or CFO. Often appears as part of a longer title like チーフ・エグゼクティブ・オフィサー.
彼は新しいチーフオフィサーに任命された。
He was appointed as the new chief officer.
チーフオフィサーとして会社の方針を決める責任
As chief officer, you are responsible for deciding company policy.