chief of staff

noun
1
an officer of very high rank, responsible for advising the person who commands each of the armed forces
رئیس ستاد, مسئول عالی‌رتبه ستادی
see also Joint Chiefs of Staff
2
a person who advises the head of an organization and who manages the other employees
رئیس کارکنان, رئیس ستاد, مدیر کارکنان, رییس پرسنل
We'll discuss it with the president's new chief of staff.