Who is the Serjeant-at-Arms? How many female Serjeants-at-Arms have there been?
The Serjeant-at-Arms carrying the Mace.

DPS Auspic
Description
The Serjeant-at-Arms carrying the Mace in the House of Representatives. Behind her is the Speaker of the House of Representatives.
Permission should be sought from DPS AUSPIC for third-party or commercial uses of this image. To contact DPS AUSPIC email: auspic@aph.gov.au or phone: 02 6277 3342.
The Serjeant-at-Arms is one of the few people, other than members of the House of Representatives, who work in the House of Representatives. There have been 5 female Serjeants-at-Arms in the Australian Parliament.