Jason was born in Jasper, Alabama. He graduated from Shelby County High School in Columbiana, Alabama and has a Bachelor's degree from UAB with a Major in English and a Minor in History.

In 2007, Aaron began writing for Marvel Comics with an extended run on Marvel's Ghost Rider, along with a Secret Invasion tie-in for Black Panther with David Lapham. The contract does not effect his work on Scalped, his creator-owned series for DC/Vertigo. He also wrote the Penguin issue of The Joker's Asylum.

After a 4-issue stint on Wolverine in 2007, Aaron returned to the character with the ongoing series Weapon X, launched to coincide with the feature film Wolverine. "With Wolverine: Weapon X we'll be trying to mix things up like that from arc to arc, so the first arc is a typical sort of black ops story but the second arc will jump right into the middle of a completely different genre," says Aaron. In 2010, the series will be relaunched once again as simply Wolverine.

Aaron currently lives in Prairie Village, Kansas, a suburb of Kansas City with his wife and two sons. Aaron is a cousin of Gustav Hasford, author of The Short-Timers, which was later adapted into the film Full Metal Jacket. Jason wrote The Other Side to honor Hasford.

Comics work includes:

• The Other Side (with Cameron Stewart, five-issue mini-series, DC/Vertigo, 2006)
• Scalped (with R. M. Guéra, DC/Vertigo, 2007- ongoing) collected as:
• Volume 1: Indian Country
• Volume 2: Casino Boogie
• Volume 3: Dead Mothers
• Volume 4: The Gravel in Your Gut
• Volume 5: High Lonesome
• Pilot Season: Ripclaw (with Jorge Lucas, one-shot, Top Cow, 2007)
• Wolverine:
• Wolverine, vol.2 #175, Marvel
• Wolverine, vol. 3 #56 (with Howard Chaykin, Marvel, 2007)
• Wolverine, vol.3 #62-65: "Get Mystique" (with Ron Garney, Marvel, 2008)
• Manifest Destiny (with Stephen Segovia, 4-issue mini-series, Marvel, 2008—2009)
• Wolverine, vol.3 #73-74: "A Day in the Life" (with Adam Kubert, Marvel, 2009)
• Weapon X #1-16 (Marvel, 2009-2010)
• Friday the 13th: How I Spent My Summer Vacation (with Adam Archer, two-issue mini-series, DC/Wildstorm, 2007)
• Ghost Rider:
• Ghost Rider #20-35 (Marvel, 2008-2009)
• Ghost Riders: Heaven's on Fire #1-6 (Marvel, six-issue mini-series, 2009—2010)
• Immortal Weapons #1
• X-Force Special: Ain't No Dog (with Werther Dell’Edera, one-shot, Marvel, 2008)
• Black Panther #39-41: "See Wakanda and Die" (with Jefte Palo, Marvel, 2008)
• Hellblazer #245-246: "Newcastle Calling" (with Sean Murphy, Vertigo, 2008)
• The Joker's Asylum: "The Penguin" (with Jason Pearson, one-shot, DC Comics, 2008)
• The Punisher:
• The Punisher X-Mas Special (with Roland Boschi, one-shot, Marvel, 2008)
• PunisherMAX #1-present (Marvel, 2009-ongoing)
• "Get Mystique (Slight Return)" (with Jock, in Dark X-Men: The Beginning #3, Marvel Comics, October 2009)

Interviews

• Interview on Comic Geek Speak Podcast (June 2009)
• 2007 Jason Aaron interview with Jon Niccum
• Interview with Jason Aaron on the Comic Geek Speak podcast (December 2007)
• Around Comics Interview (November 2007)
• Around Comics Interview (December 2006)