who is the director?
Tetsurō Araki
Attack on Titan
An anime series based on the manga is currently being aired in Japan. Produced by Wit Studio and directed by Tetsurō Araki, a first season aired between April 7, 2013, and September 29, 2013 originally on Mainichi Broadcasting System (MBS). 
where did titans came from attack on titan UNANSWERABLE is it a film or tv series? An anime television series
wiki:24158531
Attack on Titan [SEP] Anime
An anime series based on the manga is currently being aired in Japan. Produced by Wit Studio and directed by Tetsurō Araki, a first season aired between April 7, 2013, and September 29, 2013 originally on Mainichi Broadcasting System (MBS). The second and the third season, directed by Masashi Koizuka, first aired from April 1, 2017 to June 17, 2017, and between July 23, 2018 and July 1, 2019 respectively on MBS and NHK General TV. Upon the airing of the final episode of the third season on July 1, 2019, it was announced that the fourth and final season of the anime series is scheduled for release in Fall 2020 on NHK General.