Residence: Somewhere in Mythburg, but definitively does not live in The Cans.
Game Use
Mage stat block, page 199 of the MM.
Minifigure of a wizard holding a spellbook in one hand and fire in another.1)
Development
The Party were referred to Alex for by the owner of Outkast Magics to help with the Blue Bag Of Hoarding. Alex was able to help The Party with their problem, which returned all of Urist & Eyrun's stuff. As payment Alex got to keep the bag.
Player Characters are aware of Alex's Magical Water Desalination Project because they met up there to talk about the bag. There isn't anything nefarious about the project as best we know.