Christos Gage sold his first screenplay in 1997 and has been working steadily ever since; he started writing comics in 2004 with DC's Deadshot miniseries, featuring the sharpshooting antihero from Suicide Squad. He then began co-writing Avengers- The Initiative with Dan Slott, which led to him becoming the sole writer on the book and its successor, Avengers Academy. His additional Marvel credits include Civil War- Casualties of War, House of M- Avengers, Iron Man, Union Jack and World War Hulk- X-Men, as well as a prominent run on X-Men- Legacy.