Gael is the highest level wizard known to Varis in Acanthia. At a rough estimate, he seems between level 4 and 7. He works in an office in north-west middle ring, and appears to do a lot of work in religious rituals (judging from the overwhelming smell of incence and ritual books in his study).
Gael shows the Literati penchant for new and exciting information (e.g. the time bubble), and is indeed under the protection of the Literati, care of the Red Cloaks. He has said that the protection is necessary due to previous attempts to kidnap/murder/something him.