責任者 big dog〈米俗〉●can-carrier〈俗〉●curator●honcho〈米俗〉〔【語源】日本語の班長から〕●person in charge●responsible official

責任者が(主語)にサインしなければならない should be signed by a responsible person

責任者で in charge

責任者とする委員会〔~を〕 committee responsible for

責任者と話をする talk to someone in charge

責任者の艦長 commanding officer in charge

責任者の認識の甘さが目立つ reflect someone's low sense of responsibility

責任者を呼んできます Let me get the supervisor.

責任者を呼んで来い! Go get the manager!

責任者遺棄 neglecting one's responsibility as a guardian