Chief of staff

Chief of staff was a title given to a senior member of a service organization or agency. This individual was usually responsible for overseeing the various branches of the service.

In 2155, E.W. Roddenberry was chief of staff at Starfleet Command's Fleet Operations Center on Earth. ( artwork)

In 2293, General Chang was Chancellor Gorkon's chief of staff. 

In 2365, Elizabeth Vallis served as Prime Minister Wilson Granger's chief of staff at the Mariposa colony. 

In 2366, Ki Mendrossen served as Ambassador Sarek's personal chief of staff. 

In 2372, General Martok served as Chancellor Gowron's chief of staff. 

Starfleet chiefs of staff
In 2372, Weyoun made a proposal to Captain Benjamin Sisko that the Dominion would make him ruler of the Federation, with "no President or Starfleet chief of staff". 

The following individuals served as Starfleet chief of staff:
 * Admiral Jonathan Archer - 2169
 * Fleet Admiral Robert Bennett - 2287
 * Admiral Les Landau - 2345
 * Admiral Gene Roddenberry - 2363-2375