Director of the First Contact Office
The Director of the First Contact Office (or DFCO) heads the SFFCO's operations and is a member of the Starfleet Chiefs of Staff (SCS).
Unlike the other Chiefs, the Director is not a military officer as the FCO is organized as a civilian agency outside of the standard chain of command.
Much as a ship's Chief Medical Officer may overrule a commanding officer in areas of medical import, the DFCO may do the same to other fleet officers in areas pertaining to First Contact operations, and is only subordinate to the Commander, Starfleet and Federation President.
The current Director of the First Contact Office is awaiting appointment.