Proposed Canon
He is most likely living in the Magic Kingdom.
Hubble may eventually be Retconjured into a Findamancer since the hard copy of Book One states that the Summon Perfect Warlord Spell was created by Predictamancy and Findamancy, not Predictamancy and Lookamancy.
Alternatively, Hubble may be among the few casters who, like Wanda, can cast outside their main discipline. If he can cast Findamancy in addition to Lookamancy, he could have participated in the creation of the spell without contradiction.