I'll tell you what I remember.
His dad was a government liaison officer or something in the colony of British Guyana in SA. He went to visit him and ended up becoming intrigued by the people on the Brazilian border called the Wapishana Indians. He became a cowboy for them, herding cattle and taking them on runs to the city of Georgetown.
They decided to give him a new horse. The horse had killed two men already, it's name meant The Devil in Wapishanan. The horse ended up bucking him and trampling him, resulting in serious injury. The closest doctor was a thirty day journey away; that's when he got the idea of taking medical care to remote places and to people in serious need.
He worked in South and Central America, including Haiti, Guyana, Brazil, etc. He then brought his organization to the US. For the past 12 years he has set up a weekend long event in Wise, VA (where my parents where raised) to distribute free dental, optical, and medical care to people without insurance or who would not be covered by the insurance they do have.
He normally treats 1000 people a day over 2 1/2 days at each location. He just got back from Henderson, TN and is currently planning a trip to Oakland and Sacramento, CA. It's awesome what he does. Especially for Indian reservations, which I'd love to talk to ITC about. I think he would be interested in a project that Mr. Brock is bringing to a Knoxville ranch.