Phil Williamson is a human, and the Head Of Conjuration in the Council Of Wizards. Nobody has figured out he actually isn't a Wizard(not even Windcell The Incel), and is in fact a normal human born in Harlem that 'conjures' things by just buying them off of Amazon and getting one day shipping. Due to this, Phil is several million dollars in debt and has to continue wizarding so he can stay off the streets.
Naturally, Phil's school of magic focuses mainly on summoning things, whether that be creatures, items, or tools. Usually, the higher a wizard's proficiency, the more things they can summon and the more impressive things they can summon.
Phil hasn't told anyone his last name, as 'Williamson' is a English surname and thus, not of Wizard nomenclature.