Chief of staff
IDENTIFIES THE LEADER OF A COMPLEX ORGANIZATION, INSTITUTION, OR BODY OF PERSONS
Chief Of Staff; Chief of staff (military); Chief of staff (US military); Chief of staff (politics); Chef d'état-major; Chef d’état-major; Chief of Staff; Chef d'État-Major; Chief-of Staff; Chiefs of staff; Chief-of-staff; Chief of the Staff; Chief of Staff (military); Chief of Staff of the Armed Forces
The title chief of staff (or head of staff) identifies the leader of a complex organization such as the armed forces, institution, or body of persons and it also may identify a principal staff officer (PSO), who is the coordinator of the supporting staff or a primary aide-de-camp to an important individual, such as a president, or a senior military officer, or leader of a large organization.