Check out his website here:
http://www.chrismcdougall.com/
And in particular his TED talk through which I first heard of him (and barefoot running):
http://www.ted.com/talks/lang/en/christopher_mcdougall_are_we_born_to_run.html
I'm Dr Nick and for a whole year back in 2007 I decided to go barefoot. Since then I've returned to a more shod existence, but I'm still a barefoot evangalist.