In 2000 he went to work for Marvel Comics as a senior editor. While there, he edited Spider-Man and X-Men-related books before ascending to vice president, executive editor in 2010, and editor in chief in January 2011, replacing Joe Quesada. He has also worked as a writer and inker.
From 2000 to 2011, he held various positions at Marvel Comics, including senior editor, vice president, executive editor, and editor-in-chief. He was responsible for editing Spider-Man and X-Men publications and also worked as a writer and inker.