Several of the series more junior writers became executive producers during its run. Glen Mazzara was an executive story editor for the first season and became an executive producer from the fifth season onwards. Mazzara had also worked with Ryan on "Nash Bridges". Kurt Sutter and Scott Rosenbaum were staff writers for the first season and became executive producers for the sixth season onwards. Adam E. Fierro joined the crew as a co-producer and writer for the third season and was promoted to executive producer for the seventh season. Veteran television writer Charles H. Eglee joined the crew as a consulting producer for the third season and was promoted to executive producer from the fifth season onwards.