There's been rumours about his departure from Riot and now it's official. He's been responsible for most of the game balance and has been pretty transparent about the changes on Twitter.
Not exactly sure for how long exactly he has been the new game balance leader, but it wasn't for very long and this counts the second big departure of a League of Legends employee in the same segment, in one season.
External link →No, that was written by Riot Cashmiir.
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Just to clear this up because I have seen this misconception multiple times so far. Jag was not in the same position is Mark Yetter. Mark was the Lead Designer of the Gameplay Initiative, which includes SRT (who handles balance among other things like PreSeason, etc.) Champions Team and a few other teams. Jag was just the lead design for SRT. When Yetter went to a RnD team Jag took over doing the posts about balance, but didn't take over his position as Gameplay Design Lead
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