Hubble was the Lookamancer who created the Summon Perfect Warlord Spell in a link with a Predictamancer. According to Janis, he was one of the few people aware that the spell was intended to summon a warlord to end war itself.LIAB Text 37
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.