He appears briefly in one scene in the final episode of season 6, (s06e10) he sits at at a table in the Citadel, writing, when Sam and Gilly enters, they have a short discussion, the citadel is not aware of the changes that has happened at castle black, still thinking that Jeor Mormont is lord commander and Aemon is maester (they are dead) so he goes to fetch the Arch Maester so he can decide what should happen. Sam is granted access to the library, where apparently women and children cannot access, so Gilly and little Sam are forbidden to follow, what happens next to them is not revealed (yet)He is credited as Citadel Maester , but he is only a measter, as the Citadel has an Arch Masester...