John Ostrander is a prolific comic book author who has written several titles set in the DC, Marvel and Star Wars universes. He co-created the Oracle persona for Barbara Gordon and created the second and modern version of the antihero team the Suicide Squad, of which the films Suicide Squad (2016) and The Suicide Squad (2021) are based on.
From Wikipedia
John Ostrander (born April 20, 1949) is an American writer of comic books, including Suicide Squad, Grimjack and Star Wars: Legacy.
He co-created the Oracle persona for Barbara Gordon and created the second and modern version of the antihero/supervillain team the Suicide Squad, of which the films Suicide Squad (2016) and The Suicide Squad (2021) are based on.