Brock is British by birth, and an adventurer at heart. He was a cowboy in the Amazon and then, incredibly, he was discovered by TV's "Wild Kingdom." Brock was a star - sort of a naturalist daredevil - for the program in the late 1960s and early 1970s.
Today Brock is devoted to RAM - completely devoted. He has no family, takes no salary, and has no home. Brock lives in an abandoned school that the city of Knoxville leases to RAM for $1. Until recently, he took showers in the courtyard with a hose.
How does he pay for all the care and supplies?
"In the first place we really know how to stretch the dollar. We operate entirely on the generosity of the American people. I'd like to say that we had big corporate support in America but we don't. So it's the little checks from those people who send in the $5 and $10," Brock explained.
RAM operates on a shoestring budget of about $250,000 a year. Yet, last year, it treated 17,000 patients. On the Saturday 60 Minutes stopped by, there was no sign of a let up.
"What have you accomplished today?" Pelley asked.
"Approximately 600 people actually showed up here and we were able to do just about everybody I think we turned away about 15 people who are going to come back tomorrow anyway," Brock said.
The next day, Sunday, there were hundreds more. Tickets started again with number one. But now, the doctors were racing time. In hours they'd be heading home.
Nurse practitioner Teresa Gardner, who brought in a portable women's health clinic from Wise, Va., was worried about Rebecca McWilliams. McWilliams had surgery for cervical cancer in 2005, but without the recommended follow up.
"It's been two, about two years since I've had my last pap smear and I was supposed to have every six months and I've only had it once since that surgery," McWilliams told Pelley.
"I think many doctors would say you've taken a terrible risk waiting this long," Pelley remarked.
"I've really have. But it's just, like I said, it's very hard to afford it. I have three kids. And my husband lost his job this past summer," McWilliams, 28, explained.
McWilliams' pap smear came back clear, but in her exam Gardner found reason to worry. "I think just from the clinical inspection of the cervix that, you know, possibly, there is a possibility that cancer, you know, still being there," Gardner explained.