キーパーソン

noun

key person; important person

Refers to a person who plays a crucial or central role in a project, organization, or event. Often used in business and media contexts.

• このプロジェクトのキーパーソンは彼かれだ。

  He is the key person for this project.

• 事じ件けんのキーパーソンと見みられる人じん物ぶつが取しゅ材ざいに応おうじた。

  A person regarded as a key figure in the incident responded to the interview.