Marc is writer of TV serials CSI Miami, Law & Order, The Practice and the most recently Arrow. Now he is also currently writer of Marvel Comics, including Wolverine. He's working on The Amazing Spider-Man.
Wrote a run of Flash, which did not appeal to the fans of the series. His Resurrection is in current print by Oni-Press.
Guggenheim will be taking over the duties of writing the X-Men title from writer Brian Wood in August of 2014.