Chief of staff

Definition and stakes

Portrait of Charles DeLano Hine Charles DeLano Hine Letters from an old railway official… (1912)

For, my boy, the unit system of organization on the Harriman Lines, of which you have read more or less, is primarily a substitution of the modern chief of staff idea for the grown, dwarfing, irrational government by chief clerks. [1]
The unit system of organization requires that an official, whether the head of the unit or an assistant, shall, when absent on the line, be represented at headquarters by the senior or chief assistant of the unit. Such senior or chief assistant is in effect, though not in name, the chief of staff.
Source: Wikisource

Various Continental Monthly , Vol. 6, No…

Of the departmental staff, the assistant adjutant-generals and assistant inspector-generals are denominated the 'general staff,' because their functions extend through all branches of the organization, while the other officers are confined exclusively to their own departments.
The chief of staff is a recent French imitation. The first officer assigned in that capacity was General Marcy, on the staff of General McClellan, in the fall of 1861.
Source: Gutenberg

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