I have been a fan of Daniel Sperling, a Professor at UC Davis, for many years. I have really enjoyed his articles in the University of California Transportation Center Access magazine.
Sperling was recently on the Jon Stewart Show (Comedy Central) discussing the book he co-authored Two Billion Cars. It was especially interesting how (relatively!) serious Jon Stewart was. Here's the clip:
Too bad some of Sperling's ideas were not implemented when we still had time to save the auto industry!