Following the end of AMC’s Breaking Bad, the series’ co-executive producer George Mastras is heading to HBO with a two-year overall deal. Under the pact, I’ve learned that he is in discussions to join the pay cable network’s long-gestating rock ‘n’ roll drama from Martin Scorsese, Mick Jagger and Terence Winter as new showrunner. The position just became vacant following the exit of Brian Koppelman and David Levien. According to HBO, Mastras is in talks on a number of HBO projects, including the rock ‘n’ roll drama. CAA-repped Mastras was on Breaking Bad for the series’ entire five-season run, rising to co-executive producer. He wrote one of the acclaimed series’ final episodes, “To’hajiilee”, and shared in the show’s Best Drama Series Emmy last month where he also was nominated for writing last year’s “Dead Freight” episode.