While I have heard of Bart Yasso, I didn't really know a lot about him. He has a great story and job! I read a good interview with him on "RunnerDude's Blog" he, RunnerDude, also does good work, so have a look at his blog if you haven't already.
A quote from Bart
"I tell runners all the time, my tagline is “Never limit where running can take you” and I truly mean that physically, mentally, spiritually, emotionally. Thirty-some years ago, I just went out to run with Brandy the dog and it’s changed my life forever."
We know it, but it never gets old hearing it ;)