EXCLUSIVE: Boss executive producers/co-showrunners Richard Levine and Lyn Greene are exiting Starz’ new drama series, which was renewed for a second season last month ahead of its premiere last night. The former Nip/Tuck executive producers shepherded the 8-episode first season of Boss alongside series’ creator/executive producer, Apocalypto co-writer Farhad Safinia. Safinia didn’t have TV experience before creating the show but I hear he proved a quick study during production of the first season. Search is under away for a new writing executive producer to join Safinia as well as the series’ other exec producers — director Gus Van Sant, star Kelsey Grammer, Brian Sher and Stella Bulochnikov — for Season 2. Boss, from Lionsgate TV, stars Grammer as a ruthless Chicago mayor who has a secret that threatens to topple him. The series has received mostly favorable reviews, especially when it comes to Grammer’s performance.