Brian Azzarello has been writing comics professionally since the mid-1990s. He is the author of Jonny Double, Batman: Broken City, and the Harvey and Eisner Award-winning 100 Bullets, all created in collaboration with artist Eduardo Risso. Azzarello’s other work for DC includes Hellblazer and Loveless with Marcelo Frusin; Dark Knight III: The Master Race with Frank Miller, Andy Kubert, and Klaus Janson; Superman: For Tomorrow with Jim Lee; Joker and Luthor with Lee Bermejo; Sgt. Rock: Between Hell and A Hard Place with Joe Kubert; Filthy Rich with Victor Santos; and most recently the all-new ongoing series Wonder Woman with Cliff Chiang.

A native of Leones, Argentina, Eduardo Risso began drawing professionally in 1981. Risso spent many years working in Argentina as well as Europe before breaking into American comics in 1997. He worked with writer Brian Azzarello on the 1998 Vertigo miniseries Jonny Double, which began a partnership that continues to this day. Risso and Azzarello’s work on Jonny Double led directly to their partnership on 100 Bullets. Since then the duo have joined forces on the DC graphic novel Batman: Broken City, Batman: Knight Of Vengeance, and the Vertigo limited series Spaceman. Risso's work on 100 Bullets has earned him four Eisner Awards, two Harvey Awards, and the Yellow Kid Award. Currently, Risso is back on a hunt for vengeance with Azzarello on the Vertigo limited series 100 Bullets: Brother Lono.