controller
n person who controls or directs sth, esp a department or division of a large organization (尤指大机构中部门的)负责人
the controller of BBC Radio 英国广播公司广播电台负责人
an air-traffic controller 航空调度员.
Perhaps in those days I was. Pierre and I did have a very good time at the ball. But that was the last moment of happiness in our lives. That night everything changed.