John Ostrander is an American writer of comics. Originally an actor in a Chicago theatre company, he moved into writing comics in 1983. His first published works were stories about "Sargon, Mistress of War" published in the First Comics series "Warp", based on a series of plays by that same Chicago theatre company. He is co-creator of the character Grimjack with Timothy Truman, published originally as a back up story in the First Comics title, "Starslayer", before going on to appear in a comic of the same name, again published by First Comics in the mid 1980s. First Comics ceased publication in 1991, and Ostrander went on to work at other comics companies.
Prior to his career in comic books, Ostrander studied theology with the intent of becoming a Catholic priest. His in-depth explorations of morality were later used in his work writing The Spectre, a series about the manifestation of the wrath of God. His focus on the character's human aspect, a dead cop named Jim Corrigan, and his exploration of moral and theological themes brought new life to a character often thought of as impossible to write. He has also worked on Firestorm, Justice League, Martian Manhunter, Manhunter, and Suicide Squad.
At Marvel comics, Ostrander has also worked on X-Men, Bishop, Quicksilver, Heroes for Hire and the Punisher.
Ostrander has also written for other comics companies: Hotspur for Eclipse Comics; Lady Death for Chaos! Comics; Magnus Robot Fighter, Rai and the Future Force, and Eternal Warrior for Valiant.
From the mid-1980s until her death from breast cancer in 1997, Ostrander frequently co-wrote his stories with his wife Kim Yale .
Ostrander is currently one of the main writers on Star Wars: Republic for Dark Horse Comics, and many of his story arcs, such as "Twilight", "Darkness", and "The Clone Wars" stories are available in trade paperbacks.