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Longman Dictionary of Contemporary English
chief of staff
noun
EXAMPLES FROM CORPUS
▪ A mandate probably would not take effect until later, said David Moulton, chief of staff for Rep.
▪ Gough was subsequently made commander of the Fifth Army, and Malcolm was his chief of staff.
▪ He recently got a boost when Mr Mubarak replaced a rival, Salah Halabi, as army chief of staff.
▪ He stepped down as White House chief of staff in 1994 after a series of White House snafus.
▪ In a trial in March, a jury exonerated Connolly of harassing his former chief of staff.
▪ The heavy spending, which included $ 108, 000 for John R.. Sasso, former chief of staff to Gov.
Wiktionary
chief of staff

n. 1 The senior officer of any of several services of the armed forces of several nations. 2 The head of any of several political departments in several nations.

WordNet
chief of staff

n. the senior officer of a service of the armed forces

Wikipedia
Chief of staff

The title chief of staff identifies the leader of a complex organization, 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.

In general, a chief of staff provides a buffer between a chief executive and that executive's direct-reporting team. The chief of staff generally works behind the scenes to solve problems, mediate disputes, and deal with issues before they are brought to the chief executive. Often chiefs of staff act as a confidante and advisor to the chief executive, acting as a sounding board for ideas. Ultimately the actual duties depend on the actual position and the people involved.

Chief of Staff (Philippines)

The Chief of Staff of the Philippines, also known as Malacañang Chief of Staff, was an official position under the Office of the President of the Philippines. President Joseph Estrada created the position in February 2000, but described it as only being a "temporary" position. However, this position was carried over to the administration of his successor, President Gloria Macapagal-Arroyo, before being abolished in February 2008.

Chief of Staff (Ghana)

The Chief of Staff of Ghana is the coordinator of the supporting staff and the primary aide-de-camp of the President of Ghana.

Chief of Staff (Rivers State)

The Chief of Staff (COS) is an appointed executive branch official in the Government of Rivers State responsible for coordinating the operations of the Governor's office as well as assisting the Chief Executive in the management of affairs of the government. The Chief of Staff oversees members of the Executive Council and serves as the Governor's liaison with the state executive branch.

Other responsibilities include preparation of the Governor's daily schedule, organisation of meetings, arbitration of disputes, regulation of gubernatorial access.