chief of staff
noun [ C ] uk/ˌtʃiːf əv ˈstɑːf/ us/ˌtʃiːf əv ˈstæf/ chiefs of staff
（军队的）参谋长；（大机构的）幕僚长
an officer of very high rank in the armed forces or a leader in a large organization
White House chief of staff Andy Card came to see the President. 白宫幕僚长安迪·卡德来见总统。