His first professional work in television was as a production assistant on his brother's series Angel. He then went on to serve as a production assistant for David Milch on the series Deadwood, for which he also co-wrote an episode. He also wrote and acted in an episode of John from Cincinnati.
Alongside his brothers Joss and Jed, he co-created and co-wrote the parody musical Dr. Horrible's Sing-Along Blog. Recently, he has been working as a writer on the J. J. Abrams television series Fringe.
From Wikipedia
