Bill Fleming was one of the producers for the first and second seasons. He headed up the creative team of designers responsible for the look and strong visual style. He also initiated the third season location shootings.
He isn’t involved in the fourth season. The likely reason is scheduling conflicts. But in addition, some have suggested that he had such rough experiences as a director that he basically got disillusioned. That’s just
rumour and basically unverified. When I’ve spoken to him, he’s been quite happy to talk about the show.
I’ve interviewed him a couple of times, and
I still have a session or two to go. But he’s definitely one of the core creative people.