Melissa, Id add Robb Wolf to your list IMO. Robbwolf.com, Podcasts, Science of disease and fitness, Challenges even crossfit when need be, Open minded look at Paleo.

I'd add Jeff Pickett from Primalchat.com.

I think that's two different questions. SOme are founding members and there will be others who are newer but more in the current scene driving the movement foreward. I would add Gary Taubes of GCBC as one of the current drivers. For the longer haul, there is the Weston Price Foundation. Also, crossfit exercisers in general often promote paleo, even if it is not the official diet of crossfit. There is a whole pack of crossfit paleo eaters here in San Diego. Crossfit is how they got into paleo. There are a lot of crossfit websites that talk about paleo.

Going back even further, the general concept of low carb and healthy diet is old hat in the weightlifting community. Even the early Atkins concept emphasized healthy whole real foods. It was only later that with the help of the Atkins company, the concept of fresh foods was lost in the processed lowcarb foods shuffle. I think paleo was really a natural step forward from lowcarb in general.