Multiple realities
(covers information from several alternate timelines)

Personnel at Starfleet Headquarters:

Starfleet Command personnel

It can be assumed that all these personnel worked out of Starfleet Headquarters.

Other Starfleet Headquarters personnel

Dedication plaque personnel

Chiefs of Staff

Les Landau

Admiral Les Landau was noted for his work as Chief of Staff, Starfleet on the USS Brattain on stardate 22519.5. (TNG: "Night Terrors")

Gene Roddenberry

Admiral Gene Roddenberry was noted for his work as Chief of Staff, Starfleet on several ships, including:

Temporal Integrity Commission

Several members of the Temporal Integrity Commission were noted for their work on the dedication plaque of the USS Relativity. (VOY: "Relativity")

Unnamed

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