Albrecht

Brusque and to-the-point, Marshal Albrecht is an authority figure in the wardens, a subdivision of the Pathfinder wing of the Paripas Mage's Guild. Also, Harry's current boss. Knock first.

Description
At this point, dude is literally a voice.

Background
Affiliated with the Paripas Mage's Guild by way of the pathfinder wing, they work with wardens. Possibly they'd been tapped by Letitia, who the party reached out to previously, to handle the matter of the City of Brass portal in Egonia.

"And I Go Searching Through Reflections for Your Outline" (1x46)
Albrecht (then unnamed) reached out to Harry for the first time via (probably) a Sending spell to enquire about the portal situation. Because of Harry's Ring of Mind Shielding, however, whenever Albrecht wanted to communicate, Harry would have to allow it deliberately. This would manifest as a knock that the monk would hear. After some communication, Harry was sent a stone to throw into the portal, ostensibly by Albrecht or someone working for them.

"You Were the Last Good Thing About This Part of Town" (1x49)
Harry finally was able to learn the name of his boss after Albrecht reached out to him when the monk contacted him via Ingrin's Sending.

Harry
His boss! Or at least someone he reports to as a warden.