Based on the original manga by Hajime Isayama, Tetsuro Araki served as the general director with Koizuka Masashi working on the series composition for the first season.
Yasuko Kobayashi worked on the character designs while Kyoji Asano served as the Chief Animation Director.
The third season of Attack on Titan is underway and promotion for it is definitely been pretty solid.
The folks at Funimation are providing English subtitled interviews and other promotional bits and the latest they have is a nine-minute interview with Tetsuro Araki, the director of the third season.
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Attack on Titan Season 3 - Interview with Director Tetsuro Araki (English Sub)