Person in charge; the person responsible for a particular task or area — often used for contacts and staff assigned to duties.
商品の不良については営業部の担当者にご連絡ください。
For defective products, please contact the person in charge in the sales department.
新しいプロジェクトの担当者は田中さんです。
Mr. Tanaka is the person in charge of the new project.
個人情報の取り扱いについて担当者と面談した。
I had a meeting with the person responsible for handling personal information.
問い合わせの担当者が不在のため、後で折り返し連絡します。
The contact person is absent, so we will call you back later.