His first screenplay was called "Spirits in Passing". He eventually joined Vince Gilligan on the writing staffs of The X-Files and its spinoff show, The Lone Gunmen.[1] He also co-wrote the screenplays for the 2008 film Otis and the 2008 television film Infected. In 2010, he re-teamed with Gilligan on Breaking Bad, where he remained through the show's 2013 conclusion.